Observation 81567: Pluteus tomentosulus f. brunneus
When: 2011-11-07
Herbarium specimen reported

Notes: These unusual Plutei appeared during the peak of the mushroom season here in a part of planted forest where there are always a lot of other Pluteus species (P. leoninus, P. umbrosus, P. chrysophaeus etc.). They grew on fallen rotting poplar trunks (Populus nigra or P. alba). I’ve been watching that patch closely since 2007 but this year was the first time these fungi appeared. The summer was relatively wet and chilly.

I’ve been actively interested in the genus Pluteus for a while but I don’t remember seeing anything like that. They were rather large, maybe like P. cervinus or even larger, and appeared several times from July to mid-September.

The textures are very unusual – the stem is fuzzy and cap is like thick felt (similar to Volvariella bombycina).
I briefly examined it microscopically and it is indeed a Pluteus. It has abundant fusiform cheilocystidia with somewhat constricted tips and very unusual pileipellis hyphae – thick yet mingling into the pileus trama hyphae “seamlessly”; the terminal elements of the pileipellis are very thick (20 micron and more) and contain brown pigment.
I’ll post some more decent micro pictures soon.

Proposed Names

55% (1)
Recognized by sight
Based on microscopic features
75% (1)
Recognized by sight
83% (1)
Eye3 Eyes3
Recognized by sight
Used references: DOI: 10.1007/s11557-016-1215-7
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Alfredo Justo (Fredo)
2011-11-07 23:34:07 EET (+0200)

Hi Tatiana,

I guess Dr. Malysheva will be probably interested in these collections, she has done very nice work on Pluteus in Russia.

The Pluteus plautus group is need of an overall revision, DNA data has shown that there are different species but we are only starting to figure out how many, and what are the morphological characters to tell them apart.

Thank you!
By: Tatiana Bulyonkova (ressaure)
2011-11-07 22:22:44 EET (+0200)

Alfredo, this means a lot coming from you! We looked at it with Tatyana Svetasheva and our best guess was sect. Hispidoderma indeed, but no ideas below the section level. The fruitbodies in the pictures are very typical of all collections this year: they’re large, robust and relatively hard-fleshed, the stipe is well over 5 mm at the apex and close to 1 cm at the base, and the pileus of some fruitbodies was 80 mm in diameter or more. The “felt” on the surface is unusually thick, too, it’s like nothing I’ve seen before. It’s also interesting that there were typical-looking P. plautus growing on the same log and the difference was striking – I’m posting them right now to show it. They were thin-fleshed and fragile.

Tatyana proposed that I send a sample to Dr Malysheva in St. Petersburg to get her expert opinion.

section Hispidoderma
By: Alfredo Justo (Fredo)
2011-11-07 17:18:22 EET (+0200)

The texture of the cap and stipe are typical for a Pluteus in section Hispidoderma.

It is probably one of the species in the Pluteus plautus group.

Created: 2011-11-06 22:54:41 EET (+0200)
Last modified: 2016-08-22 21:09:36 EEST (+0300)
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