''Rhizomarasmius'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...

fungi A fungus (plural, : fungi or funguses) is any member of the group of Eukaryote, eukaryotic organisms that includes microorganisms such as yeasts and Mold (fungus), molds, as well as the more familiar mushrooms. These organisms are classified ...

in the family

Physalacriaceae The Physalacriaceae are a family of fungi in the order Agaricales. Species in the family have a widespread distribution, ranging from the Arctic, (''Rhizomarasmius''), to the tropics, e.g. ''Gloiocephala'', and from marine sites (''Mycaureola' ...

, containing about five species.

General

The genus was created in 2000 by R. H. Petersen to accommodate two species then classified in

Marasmius ''Marasmius'' is a genus of mushroom-forming fungi in the family Marasmiaceae. It contains about 500 species of agarics, of which a few, such as '' Marasmius oreades'', are edible. However, most members of this genus are small, unimpressiv ...

(''M. pyrrhocephalus'' and ''M. undatus''), but which do not belong there due to morphological grounds, including the nature of the

cystidia A cystidium (plural cystidia) is a relatively large cell found on the sporocarp of a basidiomycete (for example, on the surface of a mushroom gill), often between clusters of basidia. Since cystidia have highly varied and distinct shapes that ar ...

and the way the mushrooms are rooted on a plant substrate. This analysis was backed up in 2006 by DNA comparisons done by Wilson and Desjardin. Unlike most ''Marasmius'' mushrooms, members of ''Rhizomarasmius'' grow on the rhizomes of ferns or flowering plants, and that is the signification of the genus name. Instead of the

Marasmiaceae The Marasmiaceae are a family of basidiomycete fungi which have white spores. They mostly have tough stems and the capability of shrivelling up during a dry period and later recovering. The widely consumed edible fungus '' Lentinula edodes'', ...

this genus is placed in the

, a sister clade but a separate family.

Species

References

Agaricales genera Physalacriaceae Taxa named by Ron Petersen {{Physalacriaceae-stub

General

Species

See also

References