Observation 64651: Psathyrella atrospora A.H. Sm.
When: 2011-03-23
Who: Byrain
Herbarium specimen reported

Notes: Found growing in very large numbers from wood chips, the area they where found from spread quite a ways and hundreds were fruiting. The spore print is jet black with faint hints of brown.

Edit (11-1-12):

Non-truncate spores with an apical germ pore that is oblique in the side view.
Spore range = 17 – 20 × 9 – 10 μ
Average spore = 18.4 × 9.55 μ
Q range = 1.7 – 2.11
Average Q = 1.93
Cheilocystidia measured = 45×13, 52×12, 55×11, 56×10 μ
Pleurocystidia & pileocystidia not observed.
Basidia 4 & 2 spored.
Brachybasidioles present.
Setae observed on the pileipellis.
Clamps observed on the stem hyphae.
The basal mycelium on the stems is yellow when dried.

Images

138258
138259
138260
138261
138262
138263
138264
138265
138266
277895
Spore print, 1000x, mounted in KOH
277896
Spore print, 1000x, mounted in KOH
277897
Spore print, 1000x, mounted in KOH, 1μ divisions
277898
277899
277900
Pileipellis, 400x, mounted in KOH, 2.44μ divisions
277901

Proposed Names

43% (2)
Recognized by sight: Brittle cap, brittle stem, dark gills, blackish print.
-15% (3)
Recognized by sight: Yellowish stems
85% (1)
Eye3 Eyes3
Recognized by sight
Used references: North American Species of Psathyrella
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2011-03-24 03:02:51 IST (+0530)
Last modified: 2012-11-02 16:41:11 IST (+0530)
Viewed: 152 times, last viewed: 2016-10-26 23:46:15 IST (+0530)
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