Observation 160498: Psathyrella bipellis group

in redwood/doug fir grove, going under picnic table.


mature gills; thin gill section in water (note color of spores along edge).
mature gills; thin gill section in water (note color of spores along edge).

Proposed Names

4% (3)
Recognized by sight: reddish-purple cap (fading to tan), pale, gray ornamented stipe. gills pale, then dark (almost black).
Based on microscopic features: large, elliptical, smooth, thick walled, dark brown spores with a germ pore. abundant cheilo and pleurocystidia.
Based on chemical features
-8% (3)
Based on microscopic features: abundant cystidia, dark brown spores w/germ pore.
18% (4)
Recognized by sight: Do you have any micro images you can share?
75% (2)
Eye3 Eyes3
Recognized by sight: reddish cap, fades to tan, more sturdy than usual for a psath fb, blackish brown spores.
Based on microscopic features: large dark brown spores with a germ pore, many cysitida.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Byrain
2014-02-28 12:22:41 CST (-0500)

How about descriptions? Spore size? Cystidia shape? Pleurocystidia present? Smith used the name P. barlae in his book, I’m not sure if or how that name is different from P. bipellis, I’m not sure what other species in the group there would be…w/e you want to call it, the stuff I have scoped looks like a good match. See obs 64824 for comparison, the immature gill color is also very helpful as it differs from most Psathyrella.

sorry Byrain…
By: Debbie Viess (amanitarita)
2014-02-28 11:54:16 CST (-0500)

the only way you are gonna see micrographs is if you come on over to my house! my camera is kaput.

thanks Christian!
By: Debbie Viess (amanitarita)
2014-02-28 11:53:15 CST (-0500)

that actually fits these characters, other than the really robust fruit body. Before those spores were produced, tho…it was anybody’s guess!

It’s a stout frb of a Psath
By: Christian (Christian Schwarz)
2014-02-27 14:12:39 CST (-0500)

in the P. bipellis group

By: Richard Kneal (bloodworm)
2014-02-27 13:08:39 CST (-0500)

sorry. i have no idea really.

at first a thought Laccaria, now Cortinarius. :)

By: Debbie Viess (amanitarita)
2014-02-27 12:41:11 CST (-0500)

SMOOTH spores with a germ pore and the gills are loaded with cystidia. Oh, and black gills at age and dark brown (not rusty ) spores.

Not a cort.

Sorry that I can’t post the micro – camera broken. Slide available for viewing, though! :)

By: Richard Kneal (bloodworm)
2014-02-27 12:26:38 CST (-0500)

“Microscopic examination is generally required for identification of all but a few “field guide species” in the genus. Spore morphology is probably the most crucial among the microfeatures; spore shape, size, and the degree of ornamentation (from nearly smooth to strongly verrucose) can all be important in identification. Ideally, spores should be measured from a spore print so that they are unquestionably mature. A Roman aqueduct section, mounted in 2% KOH, will suffice for studying other microscopic features important in Cortinarius, which include the pileipellis (see the discussion and illustration above, under “Sliminess”), the presence or absence of clamp connections, and cystidia on the gills. Impressive, well defined cystidia are almost never heard of in Cortinarius (Cortinarius violaceus is virtually the only exception), but some species possess cylindrical to club-shaped cheilocystidia—sometimes designated as “marginal cells” when they are so inconspicuous as to be unworthy of a full-blown “cheilocystidia” designation (yes, the distinction is frustrating, and no, authors do not use these terms consistently and universally)."

it’d be interesting to see the spores in oil from a print.
the Galerina i just collected showed no signs of a plage on the gill edge, but most certainly did off of a print…

i really think this is a Cortinarius species.

By: Debbie Viess (amanitarita)
2014-02-27 12:22:54 CST (-0500)

I am throwing up a bunch “could be’s” to show what I have considered along this ID path, some prior to getting micro work done.

Laccaria could have been added to that list, until the gills turned black!

not Cortinariacea…
By: Debbie Viess (amanitarita)
2014-02-27 12:20:23 CST (-0500)

the spores are smooth with an apical germ pore.

oh yeah…
By: Debbie Viess (amanitarita)
2014-02-27 11:20:55 CST (-0500)

Telamonia crossed my mind, too. but not once those gills turned black!

By: Richard Kneal (bloodworm)
2014-02-27 11:09:49 CST (-0500)

Created: 2014-02-27 09:50:55 CST (-0500)
Last modified: 2014-02-28 12:32:28 CST (-0500)
Viewed: 114 times, last viewed: 2017-06-18 01:01:54 CDT (-0400)
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