Collybia mushrooms can be found all over the world.
Range in size from very small to quite large. Caps can be convex, umbonate, plane or depressed to funnel shaped; smooth, sometimes pruinose and often hygrophanous. Colors of Collybia mushrooms range from white/whitish, brown, gray, blue, lilac and purple. Gills are attached and can be decurrent; white ,beige or lilac in color. Stem is central and can be hollow or solid; same color as the cap or paler. No veil. Some species (Collybia tuberosa) form underground tuber-like structures called sclerotia. Spore print color can be white, cream, yellow or pink. Many have the same form and stature of some Clitocybe and Tricholoma mushrooms. Some contain the poison muscarine, while others are delicious edibles. Most are saprobes that grow from forest debris like leaves, pine duff and rotting wood. Summer and fall are good seasons to find Collybia mushrooms.
Collybia Mushrooms at Indiana Fungi
See Systematic arrangement within the family Clitocybaceae (2023)
These name changes may revert back to Clitocybe if this recent (March 2024) proposal is accepted. See Proposal to conserve the name Clitocybe (Basidiomycota) with a conserved type