Observation 174440: Pluteus leucoborealis Justo, E.F. Malysheva, Bulyonk. & Minnis
When: 2014-08-17

Notes: Growing solo on old maple log, 1 m above ground. Cap 4 cm across.

Odor mild. Didn’t taste it.

Spores 7-8 × 5-6. Cystidia and other micro info given with photos.

[Reference: Justo & Castro, Pluteus nothopellitus sp.nov. and a review of
white species in Pluteus section Pluteus]


Pileipellis: a cutis.
Hyphae from pileipellis, ~8 microns wide. No clamp connections.
Two types of pleurocustidia: both common. ~70 × 20.
A large pleurocystidium? 150 × 24 microns.
Inermediate (close to gill edge) pleurocystidia.
Cheilocystidia (left) and intermediate pleurocystidia.
Spheropendiculate cheilocystidia, up to 40 microns.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Pluteus leucoborealis
By: Alfredo Justo (Fredo)
2014-11-14 09:30:54 PST (-0800)


I got molecular data for this and it is Pluteus leucoborealis. The micro characters also fit very well with P. leucoborealis.

This collection represents the southernmost confirmed occurrence of P. leucoborealis in Western North America. Great find!

thanks again for sending this

By: Richard and Danielle Kneal (bloodworm)
2014-08-19 19:09:32 PDT (-0700)

awesome micro. :)

By: Alfredo Justo (Fredo)
2014-08-19 10:04:15 PDT (-0700)

if you can send this collection that would be great,


Cap surface
By: Sava Krstic (sava)
2014-08-18 22:02:27 PDT (-0700)


I actually made a photo of the cap surface last night before putting the thing in the dryer. Please take a look for yourself. The fibrils looked brownish-grey to me under the dissecting scope. I should note that the cap was dirty and that I groomed it a bit (mainly by blowing air over it) before taking photos and that it got dirtier in transport. Perhaps this dirt contributes to the non-white appearance in the photo. (Note pure white flesh on the right of the last picture where I made two parallel cuts on the surface.)

I’ll be happy to send the material to you.

grayish tint?
By: Alfredo Justo (Fredo)
2014-08-18 07:20:29 PDT (-0700)

I am really curious about this one. White and light colored Pluteus are always tricky to id.

in the first photo it looks like the cap has some light grayish tint; is that just the photo or did this mushroom have a grayish color when fresh? or was it just pure white?

nice photos as always Sava,

if you can send this over I would like to have a close look at it

Created: 2014-08-17 20:27:36 PDT (-0700)
Last modified: 2014-11-14 09:28:06 PST (-0800)
Viewed: 136 times, last viewed: 2016-10-23 20:40:45 PDT (-0700)
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