Genus of pinwheel mushrooms
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.
Description.
Species of "Collybiopsis" have a diverse range of fruiting body forms, including shapes reminiscent of the genera "Collybia", "Gymnopus", "Marasmiellus", "Omphalina", and "Pleurotus". Their gills may be free or extend down the stipe (decurrent). The stipe can be centrally or eccentrically positioned and may grow directly from the substrate (insititious) or have a slightly wider base (subinsititious). Microscopically, "Collybiopsis" is characterised by ellipsoid to oblong spores that are transparent (hyaline) and do not react with iodine stain (inamyloid). These spores produce white spore prints. The stipe surface features specialised cells called caulocystidia. The cap's outer layer (pileipellis) is distinguished by coral-like or branching (diverticulate) structures at the tips of its fungal filaments.
Species.
, Species Fungorum (in the Catalogue of Life) accept 60 species of "Collybiopsis".
References.
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