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When: 2011-11-17

Collection location: San Francisco, San Francisco Co., California, USA [Click for map]

Who: nadmoray (nadmoray)

No specimen available

Notes:
Cheilocystidia present: Conical to narrowly lageniform 30 – 40 µm
Pleurocystidia present: Conical 30 – 40 µm

Basidia: 25-35 µm Clavate.
Spores: Germ Pore Present Ellipsoid
Purple Brown

Spore measurements:
1. 12 µm x 7 µm
2. 11 µm x 6 µm
3. 10 µm x 5 µm
4. 11 µm x 6 µm
5. 11 µm x 6 µm
6. 12 µm x 5 µm
7. 10 µm x 5.5 µm
8. 10.5 µm x 5 µm
9. 12 µm x 7 µm
10. 12 µm x 6 µm
11. 11.5 µm x 6 µm
12. 12 µm x 6.5 µm
13. 12 µm x 7 µm
14. 13 µm x 6 µm
15. 12 µm x 7 µm
16. 11 µm x 6 µm
17. 10 µm x 5.5 µm
18. 11 µm x 5 µm
19. 10 µm x 4.5 µm
20. 13 µm x 7 µm

10 – 13 µm x 4.5 – 7 µm
11.35 µm x 5.9 µm
(11 µm x 6 µm)

Pieipellis an epithelium
Stipelipellis a cutis

Clamps not seen

Images

P1010511.JPG
P1010516.JPG
P1010525.JPG
P1010526.JPG
P1010530.JPG
P1010537.JPG

Proposed Names

58% (2)
Based on microscopic features
85% (1)
Recognized by sight: I think the pink staining is only sometimes there and shouldn’t be relied on as a taxonomic characteristic. Preferred synonym for Psathyrella gracilis according to Index Fungorum.

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= Observer’s choice
= Current consensus

Comments

Add Comment
Re: Reference
By: Byrain
2013-05-18 08:29:43 MST (-0700)

Honestly, the Psathyrella section in Arora is not very useful, but even with far more information, I’m not sure Smith’s keys for this subsection (Psathyrellae) of subgenus Psathyrella are much more useful, at least they don’t seem very satisfying to me. If we are to trust them, I think this keys into subsection Psathyrellae series Tenerae based on the lack of pinkish staining. After that I’m not making much progress and it would be much easier to try to key this out with specimens in hand. Though P. gracilis is not grouped in series Tenerae, instead in subsection Psathyrellae series Psathyrellae with “Pink tints developing on faded pileus margin and/or the gill edges.” So if we are to put emphasis on pinkish staining like Smith did, this might not be P. gracilis, but I don’t really have a better choice to give you either…

What reference did you use?
By: Byrain
2013-05-17 17:55:30 MST (-0700)

I tried Smith’s Psathyrella book and get a big headache half way through the subgenus Psathyrella sectional key…

Spores 9-12.5 or 11-17(-20), which would you choose?

Edit: Actually, you only have a few spores 10 µ long, so maybe the second choice, but then it asks for “Pink tints developing on pileus margin or gill edges mostly on faded basidiocarps.” or not…