Observation 128355: Rimbachia bryophila (Pers.) Redhead

When: 2012-12-19

Collection location: Stebbins Cold Canyon Reserve, Solano Co., California, USA [Click for map]

Who: Byrain

Specimen available

Found growing on a mossy rock alongside the trail with a Galerina species.

This seems to key to and match A. lobata using the reference listed, some differences would be the pure white fruiting bodies and the lack of encrusting pigment on the hyphae.

Spore range = 7 – 10 x (5) 5.5 – 7 (8) μm
Average spore = 8.4 × 6.08 μ
Q range = (1.14, 1.17) 1.29 – 1.67
Average Q = 1.38
30 spores measured.
4-spored basidia.
clamps present on hyphae.
No reaction with melzers.

Species Lists


2.44 μ divisions for the hymenial surface picture.

Proposed Names

-31% (2)
Recognized by sight: A white form?
Used references: The non-omphalinoid species of Arrhenia in the Iberian Peninsula
Based on microscopic features
55% (4)
Recognized by sight: although your spores seem much larger…
47% (2)
Recognized by sight: Anyone have a good reference for this genus?

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Macro vs. micro?
By: Byrain
2013-12-18 15:33:26 CST (-0500)

Looking in “Arrhenia and Rimbachia, expanded generic concepts, and a reevaluation of Leptoglossum with emphasis on muscicolous North American taxa” it seems “Hymenophore regularly developing into lamellaelike radiating folds” should take this straight to R. broyophila, however as already pointed out the spores for that species are listed as “Basidiospores 5-7 × 4.5-7 µm”. If I were to take the other option, “Hymenophore smooth to rugose reticulate but not organized into radiating lamellae” I end up at R. neckerae with, “Basidiospores 8 – 10.5 X 4.5-7 µm” which is a better fit… Also R. neckerae has two subsp. listed, megalospora is known from the southern hemisphere.

“6. Basidiomes deeply campanulate when mature; hymenophore scarcely rugose centrally . . . . . . . . R. neckerae subsp. neckerae
6. Basidiomes shallowly cupulate when mature; hymenophore usually rugose and slightly reticulate centrally . . . . . . . . . . . . . . .R. neckerae subsp. megalospora”

I’m not really sure, maybe a third species with macro of R. broyophila & the micro of R. neckerae…? Any ideas?

Rimbachia bryophila reference
By: Byrain
2013-02-11 20:59:29 CST (-0500)


However, the more I read about this genus the more lost I get…

Thanks for the correction
By: Byrain
2013-02-11 20:12:46 CST (-0500)

That seems closer, do you know where I can find a good reference on this species? The spore size is not too far off from this, but I observed no such cheilocystidia… http://mushroomobserver.org/image/show_image/135457?obs=63807&q=13DJk

Created: 2013-02-11 16:33:20 CST (-0500)
Last modified: 2018-01-26 00:02:14 CST (-0500)
Viewed: 164 times, last viewed: 2018-01-26 06:00:08 CST (-0500)
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