''Pseudotricholoma umbrosum'', commonly known as the amyloid tricholoma, is a species of fungus in the family Tricholomataceae, and the type species of the genus ''

Pseudotricholoma ''Pseudotricholoma'' is a genus of fungi in the family Tricholomataceae. The genus contains three species known from North America. Europe, and the Azores. Basidiocarps (fruit bodies) resemble those of the genus '' Tricholoma'', with a dry f ...

''. It was first described scientifically by mycologists Alexander H. Smith and Maurice B. Walters in 1943 as a species of '' Tricholoma''.

Rolf Singer Rolf Singer (June 23, 1906 – January 18, 1994) was a Germany, German-born mycologist and one of the most important Taxonomy (biology), taxonomists of gilled mushrooms (agarics) in the 20th century. After receiving his Ph.D. at the University ...

transferred it to ''

Porpoloma ''Porpoloma'' is a genus of fungi in the family Tricholomataceae. The genus contains about 12 species found predominantly in South America. ''Porpoloma'' was described by mycologist Rolf Singer in 1952 with ''Porpoloma sejunctum, P. sejunctu ...

'' (

subgenus In biology, a subgenus (plural: subgenera) is a taxonomic rank directly below genus. In the International Code of Zoological Nomenclature, a subgeneric name can be used independently or included in a species name, in parentheses, placed between t ...

''Pseudotricholoma'') in 1962. The mushroom is found in North America, where it fruits singly or in small groups under

conifer Conifers are a group of conifer cone, cone-bearing Spermatophyte, seed plants, a subset of gymnosperms. Scientifically, they make up the phylum, division Pinophyta (), also known as Coniferophyta () or Coniferae. The division contains a single ...

trees. Although it resembles a '' Tricholoma'' species, it is distinguished from that genus by its amyloid spores.

References

External links

* Fungi described in 1943 Fungi of North America Tricholomataceae Taxa named by Alexander H. Smith {{Tricholomataceae-stub