Genus Mycena

Mycena is a genus of about 500 species of fungi.

Rarely more than a few centimeters in width, the mushrooms are characterized by a small conical or bell-shaped cap and a thin fragile stem. Most are grey or brown, but a few species have brighter colours. Most have a translucent and striate cap, which rarely has an incurved margin. The gills are attached and usually have cystidia. Some species, like M. haematopus, exude a latex when the stem is broken, and many species have a chlorine or radish-like odour. They produce a white spore print.

The species are saprotrophic. Their edibility varies, with some members containing toxins.

Taxonomy

Mycena is a rich genus, considered one of the most abundant genera of mushrooms within the Agaricales and with species distributed across the world.[1]

Alexander Smith's 1947 Mycena monograph identified 232 species; the genus is now known to include about 500 species worldwide.[2] Maas Geesteranus divided the genus into 38 sections in 1992, providing keys to each for all the species of the Northern Hemisphere.

Many new species have since been discovered, and four new sections have been proposed. The taxonomy is complex, as most sections are not truly homogeneous, and the keys fail for some species, especially those that satisfy some criteria for only part of their life cycle. Some sections contain only one species.
source

source	iNaturalist is a citizen science platform and online social network that allows users to record and share observations about biodiversity, as well as assist in species identification. The platform allows users to upload photos or videos of plants, animals, and other organisms, which can then be identified by a community of other users. In addition, iNaturalist also has an automatic identification feature that uses computer vision to help identify species.