Observation 281644: Leccinum subsect. Scabra

Notes:
Selected for the indicated MycoFlora sequencing project. NAMP collection № MF54422.
At least two separate collections found at the NJMA foray. One of the pictured mushrooms is mine.
The caps are light to medium-brown; the surface is covered with a thin mat of short dark fibrils. The grayish pore surface bruises brown. The pallid, off-white stipes are covered with small blackish scabers; the stipe surface discolors yellowish and then brownish. The flesh is white, brown around larval tunnels and just below the cap cuticle, staining greenish-blue and then vivid blue (the color reached full intensity after a few minutes) in the lower half of stipe. The smallest of the three sporocarps didn’t blue at all.
Chemical Tests: KOH = medium-dark brown on pileipellis, instantly yellow on cut flesh but changing immediately to brown (the color is more intense in cap flesh).
All photos were taken 8-9 hrs after harvesting.

Species Lists

Images

756114
Natural light, no flash
756115
Natural light, no flash
756116
Natural light, no flash
756117
Natural light, no flash; phographed ~1 min after sectioning
756118
Natural light, no flash; photographed immediately after sectioning
756119
Natural light, no flash; phogographed 3 min after sectioning
922291

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Comments

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It would be nice…
By: Dave W (Dave W)
2017-08-22 14:04:38 EDT (-0400)

if I could get you some snellii for comparison. Couple years back this species seemed to be everywhere around here. Even a nice patch by a young gray birch maybe 30 feet from my house. But snellii seems to have completely disappeared this summer.

Dave,
By: I. G. Safonov (IGSafonov)
2017-08-21 23:13:57 EDT (-0400)

I doubt this is snellii, which is pretty much a morphological lookalike of the European variicolor. The caps here are of a uniform color and there is no reddening of the cut flesh in the upper stipe and/or cap. I might ITS-barcode this collection.

Seems like too much bluing…
By: Dave W (Dave W)
2017-08-21 22:50:43 EDT (-0400)

for L. scabrum. L. snellii should show some reddish stain in the upper stipe context. But, my guess would be L. snellii. I believe I have found snellii with little or no red stain. They may have been something other than snellii, but the ones I’m mentioning now came from spots where I had previously found classic blue/red staining snellii.

Created: 2017-07-10 21:54:32 EDT (-0400)
Last modified: 2018-09-18 16:19:58 EDT (-0400)
Viewed: 94 times, last viewed: 2018-09-18 16:23:16 EDT (-0400)
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