Rhizomarasmius
Introduction '''''Rhizomarasmius''''' is a genus of fungi in the family Physalacriaceae, containing about five species.
General The genus was created in 2000 by R. H. Petersen to accommodate two species then classified in Marasmius (''M. pyrrhocephalus'' and ''M. undatus''), but which do not belong there due to morphological grounds, including the nature of the cystidia 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 this genus is placed in the Physalacriaceae, a sister clade but a separate family.
Species  Image  Name  Notes  Distribution 120px  ''R. epidryas''    Arctic, Altai Mountains & mountains in Europe & N. America   ''R. oreinus''    90px  ''R. pyrrhocephalus''  Type species  N. America 90px  ''R. setosus''  = ''Marasmius setosus'', ''Marasmius recubans''Europe 120px  ''R. undatus''    Europe, N. America, Altai Mountains
See also *List of Agaricales genera
References