 Collybia cirrhata is a species of fungus in the Tricholomataceae family of the Agaricales order ( gilled mushrooms ) . The species was first described in the scientific literature in 1786 , but not validly named until 1803 . Found in Europe , Northern Eurasia , and North America , it is known from temperate , boreal , and alpine or arctic habitats . It is a saprobic species that grows in clusters on the decaying or blackened remains of other mushrooms . The fruit bodies are small , with whitish convex to flattened caps up to 11 mm ( 0 @.@ 43 in ) in diameter , narrow white gills , and slender whitish stems 8 – 25 mm ( 0 @.@ 3 – 1 @.@ 0 in ) long and up to 2 mm ( 0 @.@ 08 in ) thick . C. cirrhata can be distinguished from the other two members of Collybia by the absence of a sclerotium at the base of the stem . The mushroom , although not poisonous , is considered inedible because of its insubstantial size . 
