Observation 115008: Psathyrella (Fr.) Quél.
When: 2012-10-02
No herbarium specimen

Notes: Group of little brown mushrooms growing on weedy wood-chipped soil.
Caps about 4 cm across, shallowly conical/bell-shaped, light date-brown, striate/grooved with white velar remains at margin.
Dark grey close-spaced maybe-adnexed gills with two tiers on shorter gills, which look like they could be forks, with lighter edges.
White stem about 6 cm long, about 4 mm diameter with white flakes towards top.
After a few days indoors, the mushroom dried tough buff-colour without melting to ink.
Spore print black, Spores in KOH were dark grey/brown, oval with large apical germ pore, finely patterned, 10.5-12.5 × 6-7.5 microns (based on 25 spores).

Proposed Names

46% (2)
Eye3 Eyes3
Used references: From Michael Jordan’s genus key:
Gills, central stem on soil, spore powder not white —> 33
Spore powder not pink, almost black —> 47
Gills mottled —> Panaeolus, Panaeolina
Gills not mottled
Cap greasy, small delicate, not ringed —> Psilocybe
Cap dry, no ring, not deliquescent
Stem with silky appearance —> Psathyrella
Stem without silky appearance, often on wood —> Hypholoma
Based on microscopic features: Spore sizes

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Byrain
2012-10-31 13:53:40 PDT (-0700)

I forgot you are in Europe, not sure if the North American key I gave you will help…
And Psathyrella is a genera which really needs thorough microscopy to proceed in many cases. :)

By: Martin Cooper (martincito)
2012-10-31 13:50:30 PDT (-0700)

Thanks Byrain, You also previously gave me a link to a European species key (http://www.vielepilze.de/selten/psat/key/ekey.pdf) but without the microscopy it is hard to make much progress with either one :-(

By: Byrain
2012-10-31 10:52:54 PDT (-0700)

Try keying it out in here – http://quod.lib.umich.edu/...

By: Martin Cooper (martincito)
2012-10-31 08:58:54 PDT (-0700)

Then spore sizes from Michael Jordan’s book itself:
P corrugis 11-13 × 6.5-7
P pseudogracilis 11.5-16.5 × 5.5-7.5

From this I’m thinking P pseudogracilis is the best fit?
Though honestly I’m not even sure of the genus!

Created: 2012-10-31 08:55:35 PDT (-0700)
Last modified: 2012-10-31 13:53:58 PDT (-0700)
Viewed: 45 times, last viewed: 2016-10-23 21:59:27 PDT (-0700)
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