Mycena

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Mycena

Mycena rosella

Scientific classification

Kingdom:	Fungi
Division:	Basidiomycota
Class:	Basidiomycetes
Order:	Agaricales
Family:	Tricholomataceae
Genus:	Mycena

Type species

Mycena polyadelpha

Species

See text

Mycena sp. mycological characteristics:	i
gills on hymenium
cap is conical
hymenium is adnate
stipe is bare
spore print is white
ecology is saprophytic
edibility: unknown

Mycena is a genus of mushrooms, consisting of quite small mushrooms rarely more than a few centimeters in width. They are characterized by a white spore print, a small conical or bell-shaped cap, and a thin stem. Most are grey or brown, but a few species have brighter colors. Many species are hard to distinguish, and some are distinguishable only by microscopic features such as cystidia. Some species are known to be edible, while some are known to contain toxins, but most of them are not known, as they are too small to be useful in cooking. Mycena cyanorhiza contains the hallucinogen psilocybin.

Thirty-three species are known to be bioluminescent, creating a glow known as foxfire. These species are divided among 16 lineages, leading to evolutionary uncertainty in whether the luminescence developed once and was lost among many species, or evolved in parallel by several species. The evolutionary purpose of the glowing is uncertain.

There are 232 species identified in Alexander Smith's 1947 monograph about the genre, and the genus is now known to include about 500 species worldwide. ^[1] 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 been discovered since then, and four new sections have been proposed. Taxonomy is complex, as most sections are not truly homogenous, and the keys fail for some species, especially those which may satisfy some criteria for only some of their life cycle. Some sections contain only one species.