About Collybiopsis biformis (Peck) R.H.Petersen
Collybiopsis biformis is an agaric fungus species that belongs to the Omphalotaceae family, and it is found in North America. Charles Horton Peck originally published the formal description of this species in 1903, under the name Marasmius biformis. Its specific epithet biformis refers to the two distinct cap shapes Peck observed: the cap can be either bell-shaped (campanulate) or flattened. In 2021, R.H. Petersen reclassified this fungus, moving it to the genus Collybiopsis.
