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Gymnopus dryophilus

Common Name: Oak-loving Collybia

Synonyms: Collybia dryophila

Substrate: Wood

Location: Hardwoods

Spore Color: White

Gill Color: Whitish or pinkish

Comments: 

This is probably one of the most variable mushrooms that you can find out in the woods in terms of color. It is also one of the most common mushrooms. The color of the cap can range from red to ochre brown to tan to yellow.

Also look for the white, closely packed gills, white spores, and no veil on the stem.

This mushroom is also often host to a parasitic fungus called Collybia Jelly -  Syzygospora mycetophila.

Lookalikes:  

You will likely need a microscope to separate out the closest lookalike - Gymnopus brunneolus. It has chestnut brown cap and short, stubby, cheiliocystidia. Rhodocollybia butyracea has serrated gills. Gymnopus acervatus usually grows in dense clusters. Gymnopus subsulphereus has yellow gills and a yellowish cap. Gymnopus earleae has yellow gills and a darker colored cap. Marasmius strictipes has a yellow cap with a white stalk.  

Pictures:

Gymnopus dryophilus

Gymnopus dryophilus