A lamella is a thin plate-like structure, often one amonst many lamellae very close to one another, with open space between. Aside from respiratory organs, they appear in other biological roles including filter feeding, the traction surfaces of geckos, and chloroplast membranes where high permeability is important.
A lamella, in cell biology, is an extension of a thylakoid within a chloroplast, linking a thylakoid within one granum to one in another. They are the sites of photosystem I. Simply put, lamellae may be considered as a pair of membranes containing chlorophyll.
A gill, or lamella, is one of the papery ribs under the cap of a mushroom, most often but not always an agaric. As fungi are studied in more detail, several other types of fungi exhibit gills while not members of the Agaricales. it is unclear whether this is a case of convergent evolution (i.e. gill-like structures evolved separately) or evolved once.
A lamella is a gill-shaped structure: fine sheets of material held adjacent one another, with fluid in-between-(or simply 'welded'-plates). They appear in biological and engineering contexts, such as filters and heat exchangers. The microscopic structures in bone and nacre are lamellae in the materials science sense of the word.
A unit of a surface network of closely spaced uniform ribs or beams, usually arranged in two or three intersecting diagonal lines; curved vaults and domes have been built of wood, steel, and concrete lamellas.