This is a very basic type of plant in a aquarium, and bloody annoying. There are many types, you can remove it by brushes, scrapers, and chemical treatments can be used, but will also affect your other plants in your tank.

A diverse group of plants (including those commonly called seaweeds) that shows great variety of form, ranging from single-celled organisms to multicellular seaweeds of considerable size and complexity.

1.) Simple, plantlike organisms, one-celled or many-celled, containing chlorophyll, found in water or damp places. 2.) Mostly small aquatic plants that give water a green or brown color.

Any of a variety of simple, aquatic plants that lack stems, roots and leaves but usually contain chlorophyll, a green pigment that helps plants use sunlight to produce energy.

Single celled plants, most of which are microscopic. The kinds referred to here are either floating in the water or attached to solid surfaces of material in the water, such as rocks, logs, and plant stems and leaves.

large group of plant-like organisms that carry out photosynthesis but lack tissue differentiation as seen in true plants. Most species are single-celled and microscopic, such as zoochlorellae. A few are colonial and may form large tissue sheets as seen for example in kelps and other seaweeds.

a general term for the single or multicellular photosynthetic "plant-like protists" (singular: alga)

Chlorophyll-bearing nonvascular, primarily aquatic species that have no true roots, stems, or leaves; most algae are microscopic, but some species can be as large as vascular plants.

Simple, rootless plants that grow in bodies of water in relative proportion to the amounts of nutrients available. Blue-green algae are primitive algae, typically found in water high in phosphorus that form scum blooms that congregate at the water's surface. Diatoms are algae that have silica in their cell walls.

group of primitive, non-flowering plants which include certain seaweeds and microscopic phytoplankton.

A major group of polyphyletic organisms of extremely varied morphology and physiology, mostly photosynthetic, but distinguished from plants by their complex form of sexual reproduction. They are freshwater and marine, terrestrial and subterranean; some are neustonic (living at the interface of water and the atmosphere). They live in various protozoa and within other plants. They live also in soil and on soil surfaces, on long-persistent snows, and in Antarctic rocks. Thermophilic algae inhabit hot springs. (From Webster, 3d ed; from Bold & Wynne, Introduction to the Algae, 2d ed, pp1-6)

(phylum: Thallophyta)Microscopic plants that grow in fresh or salt water, in other organisms, or in water deposits on trees, rocks, etc.

simple 'plants' that have chlorophyll and photosynthesize. They do not have true stems, roots, or leaves. They range from microscopic, single cells (like diatoms) to large, multi-celled forms (like kelp). Single-celled algae are not plants but protists (Kingdom Protista) and many biologists classify all algae in the Protista kingdom.

Simple photosynthetic plants that live in water or moist places.

A microscopic plant that lives in water or damp places.

Aquatic organisms, ranging in size from single-celled forms to the giant kelp. Algae lack true roots, stems, leaves, and embryos. Algae can frequent ponds especially in the Spring, and may become difficult to eliminate. Term Definition

Microscopic, plant-like organisms that contain chlorophyll. Algae are nourished by sunlight (carrying out photosynthesis). They are introduced by rain or wind and grow in colonies, producing nusisance masses. These organisms include green, blue-green or black, brown and yellow-green (mustard) algae. Pink/red colored algae-like organisms exist, but are bacteria and not algae. There are 21,000 known species of algae.

Any of various primitive, chiefly aquatic, one-celled or multicellular organisms that lack true stems, roots, and leaves but usually contain chlorophyll. (Bottom line: includes seaweeds)

a large group of mainly aquatic one-celled or multi-celled plants, lacking true stems, roots and leaves

Any number of simple plants that contain chlorophyll but lack true roots, stems and leaves.

any of a wide variety of photosynthetic organisms lacking a vascular system; maybe be unicellular, filamentous, or complex (seaweeds).

Any photosynthetic member of the kingdom Protista. A member of the plant divisions Rhodophyta (red algae), Chlorophyta (green Algae), or Phaeophyta (brown algae).

a large group of primitive plants that live mostly in water. Kelp and other seaweeds are algae. Algae have simple bodies--many kinds exist as single cells.

Microscopic forms of plant life which enter the pool by rain, wind, dust storms or other means. There are numerous varieties - some are free floating, others grow on walls and surfaces. There are green, black and yellow or mustard types among others. Some are more resistant to chemical treatment than others.

Any of a large group of lower plants having chlorophyll but no vascular system

Plant-like organisms which grow in water. While many algae grow as a fuzz or slime without much visible structure, some is leafy. Other algae is hard and calcareous.

small plant life which grows in pool water. It comes in green, yellow and black. Slimy in texture. Yellow and black are hardest to kill.

Small plant without root or stems that grow in water or on damp surfaces.

mostly aquatic organisms that are usually photosynthetic and typically smaller and less complex than land plants

Photosynthetic organisms lacking multicellular sex organs.

nonvascular aquatic ancestors of plants, often resembling plant forms

A group of chlorophyll-bearing plants distributed in salt and fresh water, including seaweeds and kelps.

Photosynthetic plants that contain chlorophyll, have simple reproductive structures, and whose tissues are not differentiated into true roots, stems, or leaves.

Algae are classified as plants, although they share many characteristics with monerans (fungus). It is that pesky green stuff that many hobbyists try to avoid. It may become slimy over time and will grow in fresh or marine water.

Primitive, microscopic water plants. Blue-grass algae can multiply rapidly as nutrient levels rise, and can become toxic to animals and humans.

A simple photosynthetic plant that lives in aquatic environments.

A very broad group of simple plants including phytoplankton, and benthic microalgae and macroalgae that live in fresh or salt water and are capable of photosynthesis

Varied aquatic protists, or phytoplankton, that lack vascular tissue, and are usually photosynthetic. image

a large group of primarily aquatic plants that usually contain chlorophyll but lack the true roots, stems, and leaves that are characteristic of more complex plants

Small primitive plants containing chlorophyll, commonly found in surface water. Excessive growths may create taste and odor problems, and consume dissolved oxygen during decay.

Simple plants containing chlorophyll or other photosynthetic pigments: found widely in water and other damp environments.

Tiny, floating, aquatic plants that drift in the sunlit surface or of the ocean and often ocean and often give water a greenish color. Scientifically known as pltotoplankton, these plants exist as producers at the bottom of many food chains.

a single-celled plant, that can be present in a variety of colors. Of the thousands of varieties, the most common in pools are: blue-green, yellow mustard or black. "Pink" algae is actually a bacteria and is usually present as a slime. Algae can form in spots or over broad areas. Low sanitizer levels are conducive towards algae growth.

Plant-like organisms which grow in water and attach themselves to aquarium glass, plants, rocks, decorations, etc. There are many types of Algae. An overgrowth of algae is generally considered unsightly and a nuisance (but see Aufwuchs) and can create water quality problems. Always present in water, their growth is stimulated by excessive nutrients (overfeeding fish).

Microscopic plants deposited in pool or spa water by wind, rain, and dust. They thrive in sunlight and warm water, clogging filters, increasing the need for sanitizers and oxidizers, and causing slippery surfaces. There are 21,000 known species of algae.

An informal grouping of certain single- and multi-celled plants, often found in aquatic habitats. The group known as the algae is now considered to be an informal, rather than taxonomic classification, given the diversity within the group.

Photosynthetic plants with a range of pigments in addition to chlorophyll. No root, stem or leaves.

an aquatic organism that uses chlorophyll and sunlight to produce energy Minnehaha Journey of a Raindrop

large group of autotrophic organisms ranging in size from microscopic to several meters in length, living in the sea, in fresh water, and in moist surroundings on land.

Mostly aquatic, non-vascular plants that float in the water or attach to larger plants, rocks, and other substrates. Also called phytoplankton, these individuals are usually visible only with a microscope. They are a normal and necessary component of aquatic life, but excessive numbers can make the water appear cloudy and colored.

an aquatic single or multi-celled plant that is capable of photosynthesis

produce oxygen in a body of water.

(singular alga) - Simple non-seed bearing plants (including one-celled plants and diatoms and colonies of such cells).

Plant that grows in ponds when too many nutrients are present, altering the Ph and oxygen balance of a pond. May prove fatal to fish if there is too much.

A microscopic one-celled plant organism. These organisms are continually introduced into the pool by winds, dust storms, rain showers, and the like.

a group of marine or freshwater aquatic plants, many are microscopic. Examples of algae are phytoplankton, green and brown algae or "pond scum" and marine seaweeds.

primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves

Tiny plants which grow in the water and can discolor it.

plants that are usually found living in water

Simple plants that are very small and live in water through photosynthesis, algae are the main producers of food and oxygen in water environments.

The common name for the relatively simple type of unicellular or multicellular plant which is never differentiated into root, stem, and leaves, contains chlorophyll a as its photosynthetic pigment, has no true vascular system, and has no sterile layer of cells surrounding its reproductive organs. Found in most habitats on Earth, though the majority occur in freshwater or marine environments. The common name for the relatively simple type of unicellular or multicellular plant which is never differentiated into root, stem, and leaves, contains chlorophyll a as its photosynthetic pigment, has no true vascular system, and has no sterile layer of cells surrounding its reproductive organs. Found in most habitats on Earth, though the majority occur in freshwater or marine environments.

Simple marine plants that thrive in phosphate-polluted waterways.

A group of onecelled or manycelled plants, having chlorophyll, without roots, living in water.

Algae are one-celled organisms that contain chlorophyll, the green chemical in plants. We sometimes call algae "pond scum" or "seaweed."

Minute algae spores that enter the swimming pool, via rain, wind and dust, can be the free floating or the clinging type. Algae discolour and turn the water cloudy usually green or black in colour. They can give rise to slippery surfaces and undesirable odours and tastes.

A very basic type of plant that attaches to aquarium glass, plants and rocks. Overgrowth of algae can be stimulated by overfeeding your fish.

simple one-celled or many-celled plants, capable of photosynthesis; usually aquatic.

A primitive plant, which has no flowers or seeds, but has chlorophyll.

a collective term that refers to several taxonomic groups of autotrophic protists; can be single-celled or multicellular; includes diatoms, seaweeds, and dinoflagellates

Simple plantlike organisms found in water or on wet surfaces

Small aquatic plants containing chlorophyll and without roots that occur as single cells or multi-celled colonies. Algae form the base of the food chain in aquatic environments.

Comparatively simple chlorophyll-bearing plants which are capable of photosynthesis. They occur in the aquatic environment, and can be microscopic in size.

Small organisms, mostly living in water, some of which are considered plants and some of which are considered protists. Many of them only have one cell. Algae is eaten by many aquatic animals. Terrestrial (land) algae is shelter and food for small animals like springtails and mites.

Brownish or reddish aquatic plants, such as seaweed and pond scum.

Specific marine-based products derived from marine plants rich in vitamins, minerals and trace elements, which supply the skin with valuable nutrients. Applications include bubble baths, crèmes and beauty packs.

The simplest kind of green plants, usually found growing in damp or wet places.

Comparatively simple chlorophyll-bearing plants, most of which are aquatic and microscopic in size.

Unicellular or multicellular organisms having chlorophyll but lacking multicellular sex organs typical of plants.

Microscopic plant life found in abundance in nature. Can grow in swimming pools and damage surfaces and clog equipment.

Water plants - an important food for small water animals

Microscopic plant like organisms that grow in water. The main causes are usually by too much light, too much phosphate, or overfeeding.

A microscopic one-celled plant organism. These organisms are continually introduced into the pool water by rain showers, wind, dust storms, etc...

Any of various primitive, chiefly aquatic, one-celled or multicellular plants that lack true stems, roots, and leaves but usually contain chlorophyll. Included among the algae are kelps and other seaweeds, and the diatoms.

Simple, aquatic plants without roots, stems, and leaves, but with chlorophyll.

simple plants, mostly microscopic without roots and leaves.

a single-celled, plant-like organism

Non-vascular plants including seaweeds ranging from single cell phytoplankton to large, complex forms. Algae provide the most important food source for aquatic animals.

Any of various primitive, chiefly aquatic, one- or multi-celled, nonflowering plants that lack true stems, roots, and leaves, but usually contain chlorophyll. Algae convert carbon dioxide and inorganic nutrients, such as nitrogen and phosphorus, into organic matter through photosynthesis and form the basis of the marine food chain. Common algae include dinoflagellates, diatoms, seaweeds, and kelp.

Aquatic plants without true stems, roots, or leaves, ranging from tiny free-floating single cells to huge seaweeds that become fastened to rocks

Microscopic aquatic plant life which can grow on spa surfaces or float in the water. Although harmless to bathers, algae discolors the water and indicates improper sanitization.

very tiny green water plants with no true stems or leaves that can use sunlight to combine carbon dioxide and water to produce oxygen and sugar (Algae covered the surface of the pond.)

One-celled or multi-celled plants that are either suspended in water or attached to rocks or other materials. Their abundance is measured by the amount of chlorophyll in water samples. Algae are essential parts of aquatic ecosystems, providing the food base for most organisms, including aquatic invertebrates and fish. However, too much algae can degrade water quality by diminishing transparency or, when it decomposes, lowering dissolved oxygen.

See Marine Mineral Complex.

Microscopic forms of plant life that grow in the water and can discolor and contaminate it. They are brought into the pool by wind, dust storms, or other organic sources. Some varieties are free floating, and others cling to pool surfaces such as walls, steps, and ledges.

Algae is a breathing plant that flourish in pools, where they get lots of sunshine, carbon dioxide and heat. Algae is typically green, but it may also be yellow, mustard, black or blue-green.

class of almost exclusively aquatic plants including seaweeds and their fresh-water allies. They range in size from single cell forms to giant seaweeds several metres long.

very simple plants found in the ocean

Rootless plants that grow in estuaries and “feed” on nutrients (such as nitrogen and phosphorus) in the water.

Photosynthetic, almost exclusively aquatic, nonvascular plants that range in size from simple unicellular forms to giant kelps several feet long. They have extremely varied life cycles and first appeared in the Precambrian.

Plant-like organisms, which grow in water without true roots, stems, or leaves. They also lack flowers or seeds. Algae are classified as plants, although they share many characteristics with monerans (fungus). It may become slimy over time and will grow in fresh or marine water. Algae will give water a greenish color. Seaweed is a well-known example of algae.

Aquatic plant life that thrives in fresh and salt water.

Obtained from seaweed, algae is a natural moisturizer and is claimed to prevent wrinkles. Added to salt baths to boost detoxifying action.

aquatic plants that can clog ponds or streams and allow mosquito larvae to hide from fish and other predators.

Simple rootless plants that grow in bodies of water (e.g. estuaries) at rates in relative proportion to the amounts of nutrients (e.g. nitrogen and phosphorus) available in water.

(singular Alga): A simple and primitive group of photosynthetic organisms formerly placed in the Plant Kingdom but now put in Kingdom Protista. Many are single-celled, but others are multicullular, including algae known as seaweeds.

Minute floating plants distributed throughout a waterbody that can bloom and cause fish kills.

chiefly aquatic, eucaryotic one-celled or multicellular plants without true stems, roots and leaves, that are typically autotrophic, photosynthetic, and contain chlorophyll. Algae are not typically found in groundwater.

simple rootless plants that grow in sunlit waters, depending on the amount of nutrients available. Algae are usually very tiny, but large quantities in a marsh or pond can turn the water greenish or brownish. They can affect water quality adversely by lowering the dissolved oxygen in the water. They are food for fish and small aquatic animals.

Various forms of microscopic plant life that can rapidly grow and multiply in the presence of light. There are many varieties , some are free floating and others grow on surfaces. Some are more resistant to chlorine than others.

a large number of photosynthetic organisms that are generally unicellular and not classified as plants.

nonvascular photosynthetic plant-like organisms, they are informally divided into groups by their dominant pigments (i.e., green, brown, red, etc.).

large group of primitive plants, mostly aquatic; simple non-seed-bearing plants, including one-celled diatoms and multi-cellular seaweeds; usually carry out photosynthesis

Large group of unicellular non-flowering plants containing chlorophyll but lacking true stems, roots, leaves and vascular tissue. (eg Seaweed)

a very simple type of plant, that lives in water, or on moist ground.

Primitive plants, usually aquatic, capable of synthesizing their own food by photosynthesis.

Microscopic organisms found in or near water, classified as plants and capable of photosynthesis but having no roots, flowers or seeds. These constitute the primary producers in lakes. Freshwater and marine algae are found in many forms and are therefore a diverse group of photosynthetic plant organisms that vary widely in size, shape and color. Algae form ranges from the substance on rocks that it attaches to, to the froth on the water surface, to the seaweed on the shore. ( algue)

Microscopic plants capable of rapid reproduction. Common pool infestations include green floating, black wall clinging, and mustard colored stains. Discolors water and pool surfaces.

Microscopic plant-like organisms that can grow in your spa or pool. Nourished by carbon dioxide and sunlight they grow in slippery colonies or masses. Common types include: black, blue-green, green and mustard. Algaecides, maintenance of sanitizer level, shocking and superchorination can help prevent occurrence of algae in your spa or pool.

Algae are simple photosynthetic organisms that belong to the kingdom Protista. Most algae are aquatic; seaweeds are algae. Some algae are unicellular while others are multicellular.

A microscopic plant-like organisms that contains chlorophyll. Algae are nourished by carbon dioxide (co2) and use sunlight to carry out photosynthesis. It is introduced by rain or wind and grows in colonies producing nuisance masses. Algae are not disease-causing, but can harbor bacteria and is slippery. There are 21,000 known species of algae. The most common spa types are black, blue-green, green and mustard (yellow or drawn). Pink or red-colored algae-like organisms exist but are bacteria and not algae. Maintaining proper sanitizer levels, shocking and super-chlorinating will help prevent its occurrence.

aquatic plants of fresh or sea water from microscopic in size to 200 feet in length; simple, photosynthetic plants.

Unicellular algae , string and filamentous green alga

Plant like organisms that grow underwater usually produced by too much light, too much phosphate, and/or overfeeding.

Plant Critter. Algae are unable to move, they can only consume nutrients and reproduce.

Simple rootless plants that grow in bodies of water in relative proportion to the amounts of nutrients available. Algal blooms reduce the amount of dissolved oxygen in lakes and rivers and can result in fish kills.

Simple one cell plant life that transforms food to energy by photosynthesis(using light}. Can be very troublesome in cooling towers, ponds, swimming pools and other open water. Can be controlled by using a program of algaecides (algae killers}.

photosynthetic organisms with a one-celled or simple multicellular body plan.

Large group of generally aquatic, non-flowering plants, many microscopic.

Microscopic plants which contain chlorophyll and float or suspend in water. Excess algae growths can impact tastes and odors to potable water. Their biological activities affect the pH and dissolved oxygen of the water.

aquatic plants that feed on nitrogen and phosphorous, and as they decompose, deplete the water of oxygen

Microscopic forms of plant life that can enter water by rain, wind, etc. and can discolor water and pool surfaces.

Multicellular plants, occurring in water or moist ground, that contain chlorophyll but lack true stems, roots and leaves.

A low form of plant life containing chlorophyll that generally requires sunlight and air for existence. Many are microscopic but under favorable conditions can grow sufficiently dense to plug cooling tower distributors on the decks and to interfere with water splashing in the fill. Large masses often slough off the tower and plug heat exchangers or deposit in piping.

Simple rootless plants that grow in bodies of water at rates in relative proportion to the amounts of nutrients available in the water or, in the case of nitrogen, in the atmosphere overlying the water body.

Nonvascular plants, usually aquatic and capable of using carbon dioxide by photosynthesis; algae can also survive in damp soil.

simple, photosynthetic plants; lack vascular tissue (roots, stems, leaves) and require water for reproduction Anal fin an unpaired fin; located on the underside along the middle and after the anus

Algae (singular alga) are plant-like organisms that live in water. They are very simple organisms; they have no roots, no stem, and no leaves.

Microscopic aquatic plant life that contain chlorophyll. Algae are nourished by carbon dioxide (C02) and use sunlight to carry out photosynthesis. It is introduced by rain or wind and grows in colonies producing nuisance masses. Algae are not disease-causing, but can harbor bacteria, create a high chlorine demand, and it is slippery. There are 21,000 known species of algae. The most common pool types are black, blue-green, green and mustard (yellow or brown). Pink or red-colored algae-like organisms exist but are bacteria and not algae. Maintaining proper sanitizer levels, brushing and superchlorination will help prevent its occurrence.

Simple photosynthetic plants lacking stems, roots and leaves. Found in aquatic and damp terrestrial environments, algae range in size from microscopic, unicellular phytoplankton to multicellular seaweeds that are meters in length.

Microscopic plants which contain chlorophyll and live floating or suspended in water. They may also be attached to structures, rocks or other submerged surfaces. Excess algal growths can give tastes and odours to drinking water. Algae produce oxygen when exposed to sunlight and use oxygen in darkness. Their biological activities significantly affect the pH and dissolved oxygen concentrations of water.

microscopic plant-like organisms that contain chlorophyll (green coloration) and are nourished by sunlight and carbon dioxide. Rain and wind can introduce algae to pools, where it is capable of rapid reproduction. There are 21,000 known species of algae, but only a few are known to grow in pools such as green, blue-green or black, brown and yellow-green (mustard). Algae blooms may form separate spots, or seem to grow in sheets. See also "green algae", "yellow algae", "black algae", "pink algae"

Microscopic single cell plants that grow in water, contains chlorophyll and requires sunlight.

Microscopic aquatic plants. May be single cells or colonial forms, either free-floating or attached to substrates.

Simple single-celled, colonial, or multi-celled, aquatic plants.

Rootless plants that grow in sunlit waters in relative proportion to the amounts of nutrients available. They can affect water quality adversely by lowering the dissolved oxygen in the water. They are food for fish and small aquatic animals. However, when algae exists in excess, it takes away oxygen from the water, thus killing all life.

Microscopic plant life that thrive in sunshine. Their microscopic spores are continuously introduced into the pool by winds, dust storms, rain showers and so on. They grow rapidly in pool water when exposed to sunlight and temperature above 40 degree F. If not destroyed by chemical treatment, they form objectionable slime and odors and can interfere with proper filtration. Forms include green, black, yellow or mustard.

Over 20,000 species known to man! Algae may form on your pool surfaces or it may bloom in suspension. We typically know algae to be green, but it may also be yellow (mustard algae), black, blue-green or any shade in between. It may form separate spots, or seem to grow in sheets. Pink algae, is not algae at all, but a form of bacteria. Algae are living, breathing organisms that need warmth, sunlight and CO2 to thrive.

chlorophyll containing non-vascular organisms, plant or plant-like

Simple, photosynthetic aquatic plants that lack true roots, stems or leaves.

Unicellular of multicellular plants containing chlorophyll. The are aquatic or occur in damp situations and include most seaweeds.

photosynthetic plants which may be single-celled or multi-celled, some (phytoplankton) float in the water while others (tuff and macroalgae) form clumps or thick carpets on vacant surfaces, others (coralline algae) are encrusting and form a hard veneer on surfaces

Microscopic plants which contain chlorophyll and live floating or suspended in water. They also may be attached to structures, rocks or other submerged surfaces. They are food for fish and small aquatic animals. Excess algal growths can impart tastes and odors to potable water. Algae produce oxygen during sunlight hours and use oxygen during the night hours. Their biological activities appreciably affect the pH and dissolved oxygen of the water

small, often microscopic, aquatic plants in a water body

A class of plants including the ordinary sea-weeds and the filamentous fresh-water weeds.

Single or multicelled organisms, usually found in surface water, which produce their own food through photosynthesis.

Lower forms of plant life that have been in existence for millions of years. Thriving in sunlight, nutrient rich water and warmth. show...

Small plant life that stays suspended in water. Growth of algae is a major threat to the clarity of any lake.

non-vascular plants that grow submerged in marine or freshwater environments.  Large bodied algae, such as rockweed or sea lettuce, are called macroalgae.  Single-celled algae floating in the water and providing food for shellfish are called phytoplankton.

small aquatic plants which occur as single cells, colonies, or strands. Algae use carbon dioxide and nutrients such as nitrogen and phosphorus to make their own food through photosynthesis. Algae form the base of the aquatic food chain.

An umbrella term for various simple organisms that contain chlorophyll (and can therefore carry out photosynthesis) and live in aquatic habitats and in moist situations on land. The term has no direct taxonomic significance. Algae range from macroscopic seaweeds such as giant kelp, which frequently exceeds 30 m in length, to microscopic filamentous and single-celled forms such as Spirogyra and Chlorella.

Underwater growths of plant-like organisms. Some algae may resemble plants but they are actually not plants at all. Algae ranges in type from tall stalks of kelp to fuzzy growths of green hair algae to encrusting growths of coralline algae.

Simple plants, uni- or multi- cellular ranging in size from a few microns to many centimeters.

Microscopic plants that enter your pool by rain, wind and dust, among other things, and can cause discoloration of the water or pool surfaces.

A chlorophyll containing plant ranging from one to many cells in size, that lives in fresh or salt water.

A group of organisms that were previously classified as plants because they contain chlorophyll and can photosynthesise. Some are single celled, but some reach enormous size and complexity. Many use different pigments for photosynthesis and the group is made of many organisms with little else in common.

A growth of minute single-celled plants containing chlorophyll that develops on thin or bare areas in hot humid weather when soils are saturated with moisture.

microscopic organisms/aquatic plants that use sunlight as an energy source (e.g., diatoms, kelp, seaweed). One- celled (phytoplankton) or multicellular plants either suspended in water (Plankton) or attached to rocks and other substrates (periphyton). Their abundance, as measured by the amount of chlorophyll a (green pigment) in an open water sample, is commonly used to classify the trophic status of a lake. Numerous species occur. Algae are an essential part of the lake ecosystem and provides the food base for most lake organisms, including fish. Phytoplankton populations vary widely from day to day, as life cycles are short.

photosynthetic microrganisms which are mainly aquatic and differ from plants because of a lack of true stems, roots, and leaves

mainly aquatic organisms that differ from plants because of a lack of true stems, roots, and leaves

Small plant life which rarely grows in hot tub water. Often green, yellow or black, algae is slimy in texture. Yellow and black variations are hardest to kill. Algae is rare in hot tubs.

A minute fresh water plant growth which forms a scum on the surfaces of recirculated water apparatus, interfering with fluid flow and heat transfer.

Microscopic plant-like organisms that contain chlorophyll. Algae are nourished by carbon dioxide (CO2) and use sunlight to carry out photosynthesis. They find their way into the pool by rain or wind and grow in colonies, resulting in algae blooms. Algae do not cause disease, but provide an ideal substrate for bacteria to thrive in. There are over 21,000 known species of algae. The most common pool types are black algae, blue-green algae, green algae and mustard algae. Pink algae or red algae-like organisms can be found, but are in fact bacteria. Maintaining proper sanitiser levels, shock treatments and superchlorination will help to prevent or destroy algae.

simple photosynthetic plants which do not create seeds

Non-vascular photosynthetic plant-like organisms, some of which live in or on the soil. They are informally divided into groups by their dominant pigments (i.e., green, blue-green, etc.)

Any of various primitive chlorophyll bearing plants found in water including seaweeds and kelp.

Chlorophyll containing plants that grow in your pool in the absence of chlorine.

Simple rootless plants that grow in sunlit waters, on rocks and in soil, in proportion to the amount of available nutrients. They can affect water quality adversely by lowering the dissolved oxygen in the water. They are food for fish and small aquatic animals.

Organic growth that will turn swimming pool water green in color.

photosynthetic eukaryotes.

Microscopic one-celled or multi-celled forms of plant life. They thrive in sunshine. They are present on vegetation, in the air, in soil and in the water. Their microscopic spores are continuously introduced into the pool by winds, dust storms, rain showers, etc. They grow rapidly in pool water when exposed to sunlight and temperature above 40 degrees F. If not destroyed by chemical treatment, they form objectionable slime, heavy build up in the water and odors. They can interfere with proper filtration and greatly increase chlorine demand. Phosphates in the water encourage their growth.

A group of simple organisms, mostly aquatic, which contain chlorophyll and thus provide a means of photosynthesis. They could be used to absorb carbon dioxide and provide nourishment in a spaceship.

Definition: Single- or multi-celled organisms that are commonly found in surface water, such as duckweed. They produce their own food through photosynthesis. The algae population is divided up into green algae and blue algae, of which the blue algae are very damageable to human health. Excessive algae growth may cause the water to have undesirable odours or tastes. Decay of algae diminishes oxygen supplies in the water.

primitive green plants; many are microscopic.

green plants that occur both as microscopic forms suspended in water ( phytoplankton) and as larger forms attached to rocks and other substrates.

Simple plants found in water and elsewhere that have no roots, flowers, or seeds. These are usually microscopic plants and are the primary producers in lakes. See also phytoplankton and periphyton.

Microorganisms that may grow to colonies in damp environments, including certain rooftops. They can discolor shingles. Often described as "fungus."