Observation 142321: Russula adusta (Pers.) Fr.

These were growing on the ground(mostly buried) under conifers @ ~ 7000 ft.
Caps up to 18.5 cm across. Caps darkening slowly to blackish.
Gills whitish to creamy then blackish with age and drying. Trace of reddish noted on edges of largest specimen.
Stems seemed to bruise light pinkish red but eventually darkening.
Spore print white.
Spores ~ 7.6-9.3(10.0) X 6.0-7.0 microns. Somewhat thinly warted and with some short reticulations. Q(ave) = 1.34.
Taste mild.
Did not detect a strong odor.
Russula adusta seems to fit for the most part although there is little record of them this far south in the Sierras.

Proposed Names

47% (2)
Eye3 Eyes3
Used references: The Agaricales of California Russulaceae by Harry Thiers.
Mushroom Hobby website.
28% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Russula densifolia was my other choice
By: Ron Pastorino (Ronpast)
2013-08-12 01:04:13 EEST (+0300)

but all the references I found indicated it was primarily a coastal species found with hardwoods and conifers while the R. adusta seems to be always associated with conifers..
R. densifolia also usually has an acrid taste while these were mild.
As far as the odor, which I did not detect, Thiers says no odor was detected in California collections of R. adusta.
Could be either species I suspect….or neither.

another lookalike is densifolia…
By: Debbie Viess (amanitarita)
2013-08-12 00:33:27 EEST (+0300)

did you note the taste or odor?

adusta apparently has a distinctive odor of mold or old wine barrels! it can be mild tasting as opposed to the more acrid densifolia.

Cap color really not enough to separate the two…both can be brown.

Heres what the PNW key council has to say:

5b Gills close but not crowded, cap sepia to grayish brown, taste mild, odor of wine barrels

……………………………………………………………………..Russula adusta (Pers.) Fr.

CAP 7-12 cm, white to pallid buff when young, becoming grayish brown or lead gray or blackish, viscid drying shiny, margin even, cuticle inseparable; flesh hard, brittle, whitish slowly blackening when cut, sometimes showing a slight reddening phase. ODOR indistinct or of “empty wine barrels”. TASTE mild. GILLS whitish, blackening in age, crowded, regular subgills. STEM short, stout, white bruising black. SPORE PRINT white. HABITAT conifers. REMARKS There is considerable difficulty in finding a clear separation between R. adusta and R. densifolia. Supposedly R. adusta has a grayer cap as opposed to brownish for R. densifolia, a mild taste as opposed to acrid, and a less pronounced reddening of the flesh when cut or bruised."

Created: 2013-08-11 21:12:22 EEST (+0300)
Last modified: 2013-08-12 00:34:36 EEST (+0300)
Viewed: 63 times, last viewed: 2017-09-01 00:53:21 EEST (+0300)
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