Collybiopsis

Collybiopsis is a resurrected genus of mushroom-forming fungi in the family Omphalotaceae.

==Taxonomy== Collybiopsis is a genus of fungi in the family Omphalotaceae, order Agaricales. It was established by Franklin Sumner Earle in 1909 with Agaricus ramealis as the type species. The genus encompasses a large clade of non-typical Gymnopus species and includes elements previously classified under Gymnopus, Marasmius, and Marasmiellus. While some researchers have used the name Marasmiellus for this group, Collybiopsis has nomenclatural priority. The Collybiopsis ramealis complex has been shown to be genetically diverse. Molecular phylogenetics studies have led to the reclassification of numerous tax within this genus. As of 2024, several new species have been proposed within Collybiopsis. Some mycologists argue that the genus Collybiopsis may not encompass all species currently classified under Marasmiellus. As a result, they advocate for continued use of Singer's concept of Marasmiellus until the taxonomic relationships are more definitively resolved.