A fungus is any member of the group of eukaryotic organisms that includes yeasts, molds, and mushrooms. These organisms are classified in the biological kingdom Fungi.
Fungi collage
Omphalotus nidiformis, a bioluminescent mushroom
Bracket fungi on a tree stump
Widespread white fungus in wood chip mulch in an Oklahoma garden
A mushroom is the fleshy, spore-bearing fruiting body of a fungus, typically produced above ground on soil or another food source. A toadstool generally refers to a poisonous mushroom.
Fungus
…A fungus (pl.: fungi or funguses) is any member of the group of eukaryotic organisms that includes yeasts, molds, and mushrooms. These organisms are classified in the biological kingdom Fungi. A characteristic that places fungus in a different kingdom from plants, bacteria, and…
Pholiota squarrosa growing at the base of a tree
Amanita muscaria, the most easily recognised "toadstool", is frequently depicted in fairy stories and on greeting cards. It is often associated with gnomes.
A mushroom (probably Russula brevipes) parasitized by Hypomyces lactifluorum, resulting in a "lobster mushroom"
Amanita jacksonii buttons emerging from their universal veils