Hairy Rubber Cup
(Peanut Butter Cup)

By William T. Hathaway
Hairy Rubber Cup (Galiella rufa)

This fungus has a tough and hairy outer surface that is blackish in color. Its brownish, shallow center reminds us of peanut butter. The whole inner tissues are composed of gelatinous flesh — a rubbery feature that accounts for the name Hairy Rubber Cup.

Our local specimens have been found single, or in clusters, on hardwood sticks and branches that have fallen to the forest floor during wet seasons. Overall features of this fungus are such that it is almost invisible among the woodland litter; thus, it is often overlooked by those of us with an insatiable curiosity.

One of my photos is dated June 1973, the other August 1978.

(Also see this photograph in larger format, and an index to other mushrooms.)