Dry grasses, leaves, twigs, needles, shrubs or trees easily consumed by fire. More fuels cause a fire to burn faster and more intensely. Ground Fire Burning organic soil which sometimes burns several inches to several feet under ground. Ground Fires are often difficult to detect and can burn for extended periods of time.
Substances that burn readily with the release of significant amounts of energy.
Living and dead parts of trees and shrubs, organic material and surface material that can readily burn in a wildfire.
Any organic material, living or dead, in the ground, on the ground, or in the air, that will ignite and burn. General fuel groups are grass, brush, timber, and slash.
Plants and woody vegetation, both living and dead, that are capable of burning. ( FS People's Glossary of Eco Mgmt Terms)