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.
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
Russula brevipes is a species of mushroom commonly known as the short-stemmed russula or the stubby brittlegill. The fruit bodies are white and large, with convex to funnel-shaped caps measuring 7–30
A greenish band can develop at the top of the stipe.
Russula delica is one of several look-alikes.