Observation 18741: Russula grundii Thiers
When: 2009-02-22
Herbarium specimen reported

Notes: This approaches Russula grundii based on similarity to R. xerampelina (FeSO4 reactions, grey gills when dry, shellfish odor), but with complete lack of purple or red in the pileus, and lack of distinctive yellow-brown staining on stipe when cut or rubbed, although there were some yellowy-brown areas of the stipe surface..

This collection had septate pileocystidia, weakly graying in SV.

Stipe surface grey-blue, context reddish in FeSO4.
Stipe surface and context blue in guaiac.
Pileal surface blue in guiac slowly.
Lamellae immediately blue in guaiac.

SPORES: Spores with medium-size isolated warts, some spores with partially reticulate, with a few connective ridges connecting 3-5 warts.

Pileus 10 cm broad, plane to slightly uplifted-wavy. Dry, cuticle peeling just over 1/2 distance to disc. Margin not striate or obscurely tuberculate in some places.

Stipe 10 cm tall, 3 cm thick. Single pale rosy blotch at base. Not solid, distinctly stuffed with a cottony pith. NOT STAINING yellow-brown when cut.

Lamellae pale yellow, forking, slightly bumpy-intervenose, lamellulae apparently absent. Drying distinctly gray.


Copyright © 2009 Christian F. Schwarz
Copyright © 2009 Christian F. Schwarz
Copyright © 2009 Christian F. Schwarz
Copyright © 2009 Christian F. Schwarz
Tips of pileocystidia weakly greying in SV.

Proposed Names

57% (1)
Eye3 Eyes3
Recognized by sight: lack of any purple-red pigments in cap, not obviously staining yellow-brown.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2009-02-22 19:08:55 CST (-0500)
Last modified: 2009-02-22 19:08:55 CST (-0500)
Viewed: 101 times, last viewed: 2016-10-24 15:06:53 CDT (-0400)