Observation 136488: Pluteus sect. Celluloderma
When: 2013-06-15
(35.7171° -84.2406° 259m)

Notes: On soil in mixed forest with Juniperus virginiana, Pinus, and hardwoods (Acer, Quercus, Cornus florida, Juglans nigra, etc.)

Cap diameter 2-4 cm.
Spores globose-subglobose; 6.2×6.4 microns

Images

337900
337901
337902
338382
Spores are globose-subglobose
338383
Pileipellis is distinctive with these inflated cells…
338384
Pileipellis is distinctive with these inflated cells…
338385
Pileipellis is distinctive with these inflated cells…
338386
Pileipellis is distinctive with these inflated cells…
338788
Basidia consistently were found to project beyond the gill edge, very long sterigmata (4-spored)
338789
Cap cuticle in Melzer’s
338790
Large pigmented cells on the pileus
338791
Caulocystidia in KOH shown using the 20x and 40x objective
338792
Caulocystidia in KOH shown using the 20x and 40x objective
338793
Caulocystidia in KOH shown using the 20x and 40x objective
338794
gill edge, cheilocystidia???
338795
Pleurocystidia in water mount; pleurocystidia not pigmented.
338796
Pleurocystidia in water mount; pleurocystidia not pigmented.
338797
Pleurocystidia in water mount; pleurocystidia not pigmented.
338798
Pleurocystidia in MELZERS; pleurocystidia still not pigmented.
338799
Spores 100x objective, water mount
338800
Spores 100x objective, water mount

Proposed Names

57% (1)
Eye3
Recognized by sight
75% (1)
Eyes3
Recognized by sight

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Comments

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podospileus group
By: Alfredo Justo (Fredo)
2013-06-18 07:34:17 PDT (-0700)

the presence of pleurocystidia rules out seticeps. This could be seticeps var. cystidiosus as defined by Minnis & Sundberg in the Celluloderma paper, but the status of that taxon and its relations with Pluteus podospileus it is still in need of more work.

Try to find well preserved gill edges to look for cheilocystidia, you are right about photo 15 those are trama elements squashed out.

There is one taxon very close (or perhaps identical) to what we call in Europe Pluteus podospileus that I have collected several times in the Northeast and this collection could represent that species.

If you send these over I could try get molecular data (unless you prefer to get them yourself)

I think “Pluteus podospileus group” is the best we can do for now

Images
By: Christine Braaten (wintersbefore)
2013-06-18 06:45:12 PDT (-0700)

and measurements added. Pleurocystidia were not abundant (not seen on every gill) but were found (photos 17-20) and were not pigmented. Caulocystidia from photo 12 looks like it might have some pigmentation. I could not find cheilocystidia unless that is them in photo 15, but I thought that may have been the trama getting squashed out?

Yes,
By: Alfredo Justo (Fredo)
2013-06-17 06:50:33 PDT (-0700)

that is the most complete overview of sect. Celluloderma for North America. If you see any pigment on the cheilocystidia you might want to compare your collections with Pluteus eludens (http://www.clarku.edu/...)

Minnis and Sundberg (2010) Pluteus section Celluloderma in the USA. North American Fungi, 5:1-107
By: Christine Braaten (wintersbefore)
2013-06-17 06:19:06 PDT (-0700)

I’ll try keying it out in here. This should be the best and most recent reference? Thanks again!

Thanks!
By: Christine Braaten (wintersbefore)
2013-06-17 05:57:05 PDT (-0700)

I will look again for pleuro- and cheilocystidia, if they were abundant I would have seen them making sections with fresh material. I’ll make a few more sections today and provide measurements as well, and also show pictures of caulocystidia. Thanks for taking a look at it!

podospileus/seticeps group
By: Alfredo Justo (Fredo)
2013-06-17 05:47:27 PDT (-0700)

very probably in the podospileus/seticeps group considering the brown colors, the granular aspect of the cap surface and the mixed type of pileipellis (with both short clavate elements and elongated ones)

data on the presence and pigmentation of pleuro and cheilocystidia are necessary for identifying species in this group. The surface of the stipe suggests the presence of caulocystidia also.

Pluteus atriavellaneus belongs in sect. Hispidoderma

Created: 2013-06-15 14:06:40 PDT (-0700)
Last modified: 2013-06-18 06:41:17 PDT (-0700)
Viewed: 104 times, last viewed: 2016-10-27 23:36:03 PDT (-0700)
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