The North American species of Psathyrella.

1972]

PSATHYRELLA

3

Subgenus I.
Subgenus II.
Subgenus III.
Subgenus IV.
Subgenus V.
Subgenus VI.
Subgenus VII.

Singer's Classification
Lacrimaria (P. velutina)
Sect. 1. Lacrimaria (P. velutina)
Sect. 2. Psathyroides (P. melanthina)
Homophron (P. spadicea)
Hypholoma (P. candolliana)
Sect. 1. Fragilissimae (P. marcescibilis)
Sect. 2. Hypholoma (P. candolliana)
Sect. 3. Spintrigerae (P. spintrigera)
Sect. 4. Obtusatae (P. obtusata)
Sect. 5. Typhicolae (P. typhicola)
Sect. 6. Hydrophilae (P. hydrophila)
Sect. 7. Frustulentae (P. frustulenta)
Psathyra (P. fibrillosa)
Psathyrella (P. gracilis)
Sect. 1. Psathyrella (P. gracilis)
Sect. 2. Microrhizae (P. microrhiza)
Sect. 3. Atomatae (P. prona)
Sect. 4. Subatratae (P. subatrata)
Conocybella (P. michiganensis)
Cystopsathyra (P. kellermanii)

PROPOSED INFRAGENERIC CLASSIFICATION IN THE PRESENT WORK:
with Comments on Deviations from Singer's Classification
Subgenus I. Panaeolina (P. foenisecii)
Singer recognizes this as a genus but in my estimation the features
distinguishing it are not sufficient to justify a small genus so closely resembling members of the subgenus Psathyrella; Ola'h (1969) retains it
in Panaeolus.
Subgenus II. Lacrymaria (P. velutina)
This subgenus is comparable to section Lacrimaria of Singer but
different characters are used to define it: the pleurocystidia (at least
some of them) are in fascicles, the spores are usually ornamented, the
pileus is usually innately fibrillose, and the gill trama near the subhymenium has hyphae with walls often yellow-brown in KOH.
Subgenus III. Psathyroides (P. melanthina)
It contains stirpes Hispida, Lepidota, Hirtosquamulosa, and Lacrymabunda. I am considering that Kiihner and Romagnesi erected a new
subgenus even though Fayod's name was mentioned by them. Their
reference to Fayod is not complete, and Fayod did not include in his
genus the species the above authors placed there. Their use of the name
for a subgenus clearly includes the above groups of fungi. This subgenus
is comparable to section Psathyroides of Singer. The group is a natural
one and one of the most distinct in the genus.
Subgenus IV. Mycophila (P. epimyces)
This subgenus was created to sufficiently emphasize the parasitic
habitat, a very odd feature in this genus.
Subgenus V. Pseudostropharia (P. caputmedusae)
Sect. 1. Pseudostropharia (P. caputmedusae)
Sect. 2. Spintrigerae (P. spintrigera)