Phaeocalicium polyporaeum

Species of fungus

Phaeocalicium polyporaeum, the fairy pin or common pin, is a species of non-lichenized fungus in the genus Phaeocalicium. They grow to a maximum size of 2.5 mm and resemble black matchsticks, with thin stalks and wider caps, in groups or rows primarily on the caps of Trichaptum biforme. Fairy pins are a type of parasitic fungi that grow primarily on the caps of Trichaptum biforme, but have also been reported on Trametes versicolor. They often co-occur on the upper side of caps with green algae on host fungi.

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