''Inosperma'' is a genus of gilled mushroom in the family
Inocybaceae
The Inocybaceae are a family of fungi in the order Agaricales. Members of this family have a widespread distribution in tropical and temperate areas.
Taxonomy
The type genus of the Inocybaceae, ''Inocybe'', had traditionally been placed withi ...
. Previously defined as a subgenus within the large genus ''
Inocybe
''Inocybe'' is a large genus of mushroom-forming fungi with over 1400 species, including all forms and variations. Members of ''Inocybe'' are mycorrhizal, and some evidence shows that the high degree of speciation in the genus is due to adaptatio ...
'' by
Robert Kühner
Robert Kühner (15 March 1903 in Paris – 27 February 1996 in Lyon) was a French mycologist most notable for reviewing many forms of agaric (mushroom fungus) genera.
He studied at the Sorbonne, afterwards from 1921 until 1932, he was working ...
in 1980, these fungi were found to be more distantly related in a 2019 multigene phylogenetic study by Matheny and colleagues.
Description
This group of mushrooms was distinguished morphologically from other ''Inocybes'' by the absence of
pleurocystidia
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 shape of the spores. Also the stem is usually longer than the cap is wide and the
cheilocystidia
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 ...
consist each of a single cell and are often so numerous that they make the gill edge white.
''Inosperma'' is divided into two sections: ''Cervicolores'' (with a scaly cap) and ''Rimosae'' (with a radially fibrose or radially cracking ("
rimose
''Rimose'' is an adjective used to describe a surface that is cracked or fissured.