Observation 129935: Psathyrella subnuda var. velosa A.H. Sm.
When: 2012-12-17
Who: Byrain

Notes: Growing on wood chips near numerous kinds of foreign oaks, some of the duff is not oak and brought from elsewhere.

Spores range = 9 – 10 × 5 (5.5) μm
Average spore = 9.08 × 5.03 μ
Q range = (1.64) 1.8 – 2
Average Q = 1.81
20 spores measured.

Cheilocystidia common with clamps at the base.
Cheilocystidia range = (16) 18 – 30 (36) x 7 – 17 (18) μ
Average cheilocystidia = 22.41 × 11.39 μ
27 cheilocystidia measured.

Pleurocystidia scattered, some with a double apex.
Pleurocystidia range = (33) 37 – 50 (54) x 11 – 15 μ
Average pleurocystidia = 42.95 × 13.1 μ
21 pleurocystidia measured.

Caulocystidia scattered, with clamps at the base and some with a double apex similar to the pleurocystidia.
Caulocystidia measured = 18×15, 24×11, 24×12, 26×14, 28×11, 30×15, 34×11, 35×12, 35×15, 39×11, 40×14, 41×19, 54×10, 60×16 μ

Basidia 4-spored
Basidia measured = 23×8, 23×9, 23×9, 23×9, 20×10, 23×10, 23×10, 24×9, 24×10, 24×10 μ

Keying this out in North American Species of Psathyrella leads to subgenus Pannucia, sect. Appendiculatae, subsect. Largae. Using the key there this keys to P. seminuda, but the spore shape and cheilocystidia shape doesn’t match too well so taking the option for truncated spores instead I end up at P. septentrionalis and variants, but I am not convinced of that either. Smith’s illustrations show much more truncate spores & its supposed to be a cespitose to gregarious summer/fall mushroom on logs.

Images

314492
314493
314494
314495
314496
Spores, 1000x, mounted in KOH
314497
Spores, 1000x, mounted in KOH
314498
Spores, 1000x, mounted in KOH, 1μ divisions
314499
Cheilocystidia
314500
Pleurocystidia
314501
Caulocystidia
314502
Pileipellis, 1000x, mounted in KOH, 1μ divisions

Proposed Names

57% (1)
Recognized by sight
Used references: North American Species of Psathyrella
Based on microscopic features
85% (1)
Eye3 Eyes3
Recognized by sight
Used references: North American Species of Psathyrella pg. 139
obs 191209

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Psathyra subnuda P. Karst
By: Byrain
2014-12-20 13:18:32 CST (-0500)

According to a recent private conversation with Andreas Melzer, P. subnuda P. Karst is hard to interpret and nomen confusum, so P. subnuda sensu Smith might need a new name…

http://www.vielepilze.de/...

Interesting Observation
By: Caleb Brown (Caleb Brown)
2013-03-07 00:23:35 CST (-0500)

Awesome detailed notes.

Created: 2013-03-06 22:17:35 CST (-0500)
Last modified: 2014-12-03 10:14:55 CST (-0500)
Viewed: 98 times, last viewed: 2016-12-02 16:07:53 CST (-0500)
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