First person to use this name on MO: Michael Wood
Editors: Alan Rockefeller, Danny Newman, walt sturgeon, Christian, I. G. Safonov, Joseph D. Cohen, GALL Alain
Observations of:
this name (1310)
this taxon, other names (0)
this taxon, any name (1310)
other taxa, this taxon proposed (681)
Rank: Genus
Status: Accepted
Name: Marasmius
Author: Fr.
Citation: Fl. Scan.: 339 (1836)
Deprecated Synonyms: Heliomyces Lév.
Domain: Eukarya
Kingdom: Fungi
Phylum: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Marasmiaceae
Comments
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I do believe this name is valid – At least for now.

Deprecated Synonyms: Marasmius haematocephalus group, Heliomyces, Scorteus, Tephrophana, Androsaceus, Marasmius subsect. Haematocephali, Polymarasmius, Agaricus sect. Androsaceus, Discocyphella, Hymenoconidium, Hymenomarasmius, Marasmius sect. Collybiopsis, Protomarasmius