Observation 22368: Russula Pers.

When: 2009-06-19

Collection location: Silver Spring, Montgomery Co., Maryland, USA [Click for map]

Who: John S. Harper (jsharper)

Specimen available

Appeared at first to be blackened/rotted/dried russula specimens (many red and green Russula occurring in the same general area in the last several weeks). I had visited the site frequently, and think I would not have missed these specimens on previous visits had they been as old as they looked. On inspection, appeared to be a black variety of something that I have never seen. Clustered, pileus about 3 inches, stipe about 1 inch. Pileus was darker (similar to black chanterelle) than stipe, but lamella not decurrent. Within 10 hours of collection, stipe also turned black, and the interior of stipe was black throughout when cut 12 hours later. Other specimens left for observation. Will photograph tomorrow and attempt spore prints to report by supplement to this observation.

Supplemental observations: Additional specimens found at same location. Pileus apparently initially dark brownish, then turning darker to black from center, and white at very out edge. Lamellae and stipe intially pure white. Lamellae turning black with age (see photos for black sections on otherwise white lamellae view. Flesh of stipe and cap turning black when cut within 2 minutes – no intermediate red/pink stain. Odor not distinctive. Taste slowly sharp/peppery, otherwise not unpleasant.

http://www.mushroomexpert.com/... provides a key to “blushing russulas”. Seems I would have to get a microscope to reach a higher confidence ID of this specimen. But reading through the key at http://www.mushroomexpert.com/..., in light of the very quick and direct blackening (without red intermediate color), and the close gills, my guess would be R. ablonigra. But the picture at http://www.mtsn.tn.it/... is not similar, showing instead of a brown cap, a dingy white cap. Perhaps I simply have not seen this phase of the speciments I am collection, but I have not seen anything with a ligher colored plieus in my speciments yet. I have discounted R. dissimulans because of my specimens the prompt direct staining of exposed flesh to black— “discoloring slowly reddish, then grayish to blackish.” per M. Kuo at http://www.mushroomexpert.com/russula_dissimulans.html.

Proposed Names

78% (2)
Recognized by sight: one of the blackening species

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
The gills
By: Gerhard Koller (Gerhard)
2009-06-22 07:55:03 CDT (-0400)

are too crowded and thin for R. nigricans, it rather looks like R. densifolia.

Russula nigricans?
By: Daniel B. Wheeler (Tuberale)
2009-06-21 18:12:48 CDT (-0400)

Had I found it, especially a few weeks later in the year on the Oregon coast, I would have called it this.

Same opinion
By: Andreas Gminder (mollisia)
2009-06-20 19:25:39 CDT (-0400)

especially as the lamellae are obviousely all running through from cap margine to stipe and there seem to be no or only very few lamellulae (lamellae that don’t reach the stipe). The spores under microscop will tell immediately if it is Russula or not …

By: Gerhard Koller (Gerhard)
2009-06-20 18:35:47 CDT (-0400)

I quite think it has to be a blackening Russula

Created: 2009-06-20 01:24:51 CDT (-0400)
Last modified: 2010-12-09 14:53:55 CST (-0500)
Viewed: 113 times, last viewed: 2017-10-24 19:01:18 CDT (-0400)
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