Observation 142037: Russula pectinatoides Peck

Scattered in soil/duff under Tsuga, Quercus, and Pinus along Big Creek trail
Pileus: 41-54mm, 4B4-5, 5B5-6 and 6B6 ringed at center of margin, plano-convex to
applanate, depressed to infundibuliform, smooth, soapy, viscid when wet, minutely
bumpy; margin broadly TS, straight to decurved, edge crenate, context white, browning,
firm, soft; odor sweet almonds, taste mild, “oily”; cuticle peels 2/3; KOH neg; SP E
Lamellae: yellow white, close to subdistant, adnate, forking at base, lamellulae present,
brown spots in age; guaiac pos
Stipe: 35-52 × 8-15mm, yellow white browning in age, central, smooth to MLR; context
hollow with remnants turned brown; guaiac pos, FeSO4 purple brown on stipe and context, PDAB neg
Spores: (7.7-)7.4-6.9-6.4(-6.1) × (6.1-)5.7-5.3-4.9(-4.7) µm, Q= (1.41-)1.39-1.31-1.23(-1.18), ellipsoid, guttule brown in SV, attenuated apiculus, inamyloid plage; ornamentation (1.6-)1.3-1.1-0.9 µm, blunt, isolated to occasionally clustered warts, no connectives observed
Cystidia: (59-)53-46-39(-36) × (11.4-)10.9-9.4-7.8(-6.9) µm, abundant, SV pos (weakly in cheilocystidia!), filled with oily contents, cylindrical, tapering to a point apex
Pileipellis: suprapellis trichoderm, weakly SV pos elements; subpellis clearly differentiated, ixocutis

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By: Linas Kudzma (baravykas)
2013-08-09 20:32:25 CDT (-0400)

I keep doing that, hitting return and posting just the first line … ha. Your comment that hymenial cystidia have not been considered to have very much taxonomic importance in Russula is interesting, because in some cases they really do! In this case, the “almond smell” Russula, the cystidia do not seem to have those refractive (crystalline) contents so common in other groups. The area is certainly ripe for molecular studies and even simple microscopic reinvestigation! I always retain good collections of almond smell Russulas. I haven’t scoped all of them, but they are there waiting for me….

Interesting what you say Brian …
By: Linas Kudzma (baravykas)
2013-08-09 20:23:24 CDT (-0400)
Russula sect. Ingratae
By: Brian Looney (GibbiPicasso)
2013-08-09 12:18:06 CDT (-0400)

Hi Linas. I saw your other observation (http://mushroomobserver.org/image/show_image/352399?obs=141061&q=1Q07u), which prompted me to give a look at this collection. Unfortunately a bunch of my photos got deleted by accident, but I managed to go and at least get some representative photos of the features (no SV or cresyl blue shots of hymenium though). Alot of the features seem to match up. I have a pic of the hymenium in melzer’s where you can see cystidia with a darker stain than the end cells/basidia. However, the cystidia I observed had a tapering apex and did not seem as dark-staining as your photo shows. I think they would both key out to R. foetentula in the Kibby & Fatto key, but this group is in dire need of revision. Bart Buyck uses this group in talks as a poster-child for the undescribed Russula diversity in North America. Neither Peck, Hesler, Singer, Kauffman, nor Fatto mention hymenial cystidia, and they are not considered to have very much taxonomic value compared to most other groups.

Did you see those long Melzers staining cystidia like in mine?
By: Linas Kudzma (baravykas)
2013-08-08 15:34:03 CDT (-0400)

That is very distinctive in my Obs of possibly the same/similar species. I don’t see any photomicrographs of that.

Created: 2013-08-08 14:26:09 CDT (-0400)
Last modified: 2013-09-24 10:11:16 CDT (-0400)
Viewed: 108 times, last viewed: 2017-06-16 10:07:14 CDT (-0400)
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