Megacollybia
Encyclopedia
Megacollybia is a genus
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of fungus
Fungus
A fungus is a member of a large group of eukaryotic organisms that includes microorganisms such as yeasts and molds , as well as the more familiar mushrooms. These organisms are classified as a kingdom, Fungi, which is separate from plants, animals, and bacteria...

 in the Marasmiaceae
Marasmiaceae
The Marasmiaceae are a family of basidiomycete fungi which have white spores. They mostly have a tough stem and the capability of shrivelling up during a dry period and later recovering. The widely consumed edible fungus Lentinula edodes, the Shiitake mushroom, is a member of this family...

 family. Previously thought to be monotypic
Monotypic
In biology, a monotypic taxon is a taxonomic group with only one biological type. The term's usage differs slightly between botany and zoology. The term monotypic has a separate use in conservation biology, monotypic habitat, regarding species habitat conversion eliminating biodiversity and...

, the genus was split in 2007 in several species on the basis of genetic data. The type species
Type species
In biological nomenclature, a type species is both a concept and a practical system which is used in the classification and nomenclature of animals and plants. The value of a "type species" lies in the fact that it makes clear what is meant by a particular genus name. A type species is the species...

, M. platyphylla, is restricted in distribution to Europe, Scandinavia, and western and central Russia.
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