plural fungi a nonvascular plant lacking chlorophyll (and therefore does not photosynthesize), having cell walls with both cellulose and chitin, having a vegetative body called a thallus composed of hyphae, and reproducing by spores —note fungi are usually nonmobile, filamentous, and multicellular; they include molds, mildews, yeasts, mushrooms, and puffballs This definition last updated 10/24/2008