Observation 133873: Psathyrella corrugis (Pers.) Konrad & Maubl.

When: 2011-11-17

Collection location: Golden Gate Park, San Francisco, California, USA [Click for map]

Who: nadmoray (nadmoray)

No specimen available

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



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.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Re: Reference
By: Byrain
2013-05-18 11:29:43 CDT (-0400)

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…

By: nadmoray (nadmoray)
2013-05-18 01:05:10 CDT (-0400)

It was a while ago. I believe I used a combination of Aurora and Largent. Here is the full description:

Pileus 10-30 mm diameter, parabaloid to obtusely conical in age. Surface smooth, hygrophanous, striate from outer disk to margin. Color dark brown towards disk, lighter towards margin turning grayish white in age beginning at disk and fading to margin. Context thin, concolorous with pileus surface, non-staining. Stipe 40-75 mm long, 1-3 mm wide. Equal. Smooth towards lamellae, white fibrils towards base. Stuffed and very brittle. Lamellae gills 7-10 mm length from stipe attachment to pileus margin, 1-3 mm wide. Gill attachment adnexed. Spacing close to crowded. 1 to 2 series of lamellulae. Color cream colored becoming gray-brown in age. Taste and odor mild to none.
Basidiospores 10-13 µm x 4.5-7 µm (average 11 µm x 6 µm, n=20 spores), ellipsoid, germ pore present and distinct, smooth, purple brown. Spore print purple brown to black. Cheilocystidia present, conical to narrowly lageniform, 30-40 µm length. Pleurocystidia present, conical, 30-40 µm length. Basidia 25-35 µm length, clavate. Pileipellis an epithelium. Stipitipellis a cutis. Clamps present.
Specimen collected 11/17/2011
Collector: Miko R. Nadel
Collection number: 004
Locality: California, San Francisco County. San Francisco. 0.1 mile west of California Academy of Sciences on south side of Middle Drive.
Elevation: 250 feet
In large group of 20-30 growing in grass and leaf litter of eucalyptus.

What reference did you use?
By: Byrain
2013-05-17 20:55:30 CDT (-0400)

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…

Created: 2013-05-17 17:25:09 CDT (-0400)
Last modified: 2015-12-08 16:30:21 CST (-0500)
Viewed: 53 times, last viewed: 2017-06-16 00:25:30 CDT (-0400)
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