Parameter Tree:
EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > FUNGI > MUSHROOMS

Definition:
Mushrooms are a type of fungi (which are major decomposers that engage
in extracellular digestion and absorption of organic matter). Mushrooms
are of the order Basidiomycota, the club fungi, which have a fruiting body
in the aboveground portion of the plant.  


Reference:
Starr, C. and R. Taggart. 1998. Biology: the unity and diversity of life.
Wadsworth Publishing Company. Belmont, California. and Gould, J. and W.Keaton.
1998. Biological Science. W.W. Norton and Company. New York, New York.