Observation 104394: Psathyrella hymenocephala (Peck) A.H. Sm.

When: 2012-08-05

Collection location: Davis, California, USA [Click for map]

Who: Byrain

Specimen available

Growing from the ground & a root mass presumably from a ornamental shrub that was cut down alongside a path in an apartment complex, the roots still seemed somewhat alive.
They have a mild taste & the smell is mild to pleasant & remarkably similar to the maple syrup scent the candy cap Lactarius spp. have, especially after the cross sections were made, the smell faded as they dried.
The spores in KOH gradually lost their color after a while, I think this was much slower then should be expected with the species that have hyaline spores in KOH.

Spore range = 8 – 9 × 5 µ
Average spore = 8.5 × 5 µ
Q range = 1.6 – 1.8
Average Q = 1.7
20 spores measured.
Cheilocystidia measurements: 24×7, 31×10, 33×9, 36×11, 46×9 µ
Pleurocystidia absent or rare & not projecting beyond the basidia.
Basidia 4-spored.
Clamps observed on the stipe.

Using the Smith Psathyrella book this seems to match P. hymenocephala quite well outside of the possible, small, rare, & very hard to find pleurocystidia and the candy cap odor. Exploring species with pleurocystidia only leads to species with abundant & apparent pleurocystidia.


Spores soon after mounting, 1000x, mounted in KOH, 1 µ divisions
Spores after a little bit, 1000x, mounted in KOH, 1 µ divisions
Spores after a while, 1000x, mounted in KOH, 1 µ divisions
Pleurocystidia? 1000x, mounted in KOH, 1 µ divisions
Pileipellis, 1000x, mounted in KOH, 1 µ divisions
Pileipellis, 100x, mounted in KOH

Proposed Names

85% (1)
Eye3 Eyes3
Recognized by sight
Used references: North American Species of Psathyrella
Based on microscopic features

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
No one has commented yet.

Created: 2012-08-08 21:28:54 EDT (-0400)
Last modified: 2012-08-08 22:13:10 EDT (-0400)
Viewed: 99 times, last viewed: 2018-02-16 01:15:30 EST (-0500)
Show Log