Observation 111084: Psathyrella sect. Homophron
When: 2012-09-22
( 3000m)
Herbarium specimen reported

Notes: On Abies religiosa.

When dried the gills / spores in mass are somewhere between chocolate milk brown and maroon.

Cheilocystidia and pleurocystidia conical with an acute apex and a pedunculate base.

Pleurocystidia measurements: (from a squash mount)

38 [51.9 ; 68.8] 82.8 × 13.4 [17.3 ; 21.6] 25.5 µm
Q = 1.7 [2.6 ; 3.8] 4.7 ; N = 7 ; C = 95%
Me = 60.4 × 19.5 µm ; Qe = 3.2

45.09 18.96
82.62 20.03
56.85 13.24
57.55 17.50
61.32 20.49
55.49 23.44
63.69 22.01
0.00 20.00

Cheilocystidia measurements: (from a squash mount)

48.9 [50.3 ; 54.1] 55.5 × 14.9 [16.8 ; 22] 24 µm
Q = 2 [2.3 ; 3.1] 3.4 ; N = 3 ; C = 95%
Me = 52.2 × 19.4 µm ; Qe = 2.7

54.09 17.98
50.99 18.19
51.41 22.10

Pileus trama made of irregular subglobose cells, 10 – 40 × 10 – 20 micrometers.

Pileipellis cellular.

Spore measurements:

8.5 [9.3 ; 9.7] 10.5 × 3.9 [4.2 ; 4.5] 4.8 µm
Q = 1.9 [2.1 ; 2.3] 2.5 ; N = 20 ; C = 95%
Me = 9.5 × 4.3 µm ; Qe = 2.2

9.17 4.79
9.67 4.45
9.44 4.48
8.79 3.95
8.71 4.39
9.04 4.58
9.49 4.38
9.72 4.45
9.54 4.45
9.72 4.10
9.37 4.07
10.02 4.33
10.69 4.70
9.42 4.47
10.53 4.41
9.65 4.25
9.53 4.24
9.21 3.79
8.61 4.37
9.36 4.25

Images

265431
IMG_7206.JPG
265426
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265427
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265428
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265429
IMG_7204.JPG
265430
IMG_7205.JPG
265432
IMG_7209.JPG
265433
IMG_7210.JPG
265434
IMG_7212.JPG
young cap
315356
IMG_2082.JPG
Pileus cross section 100x
315357
IMG_2083.JPG
Pileipellis cross section 400x
315358
IMG_2084.JPG
Pileipellis cross section 400x
315359
IMG_2085.JPG
Pileipellis cross section 400x
315360
IMG_2086.JPG
Lamellar trama 400x
315370
IMG_2087.pixi.jpg
Pleurocystidia 400x
315374
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Pileus trama 400x
315380
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Pleurocystidia squash mount 400x
315381
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Spores 1000x
315382
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Pileipellis scalp section 400x
315383
IMG_2123.JPG
Pileipellis scalp section 400x
315384
IMG_2110.pixi.jpg
Cheilocystidia 400x
315386
IMG_2117.pixi.jpg
Cheilocystidia squash mount 400x
315428
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Dried collection
315429
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Dried collection
315430
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Stipe cuticle scalp section 400x
315431
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The closest thing that I could find to caulocystidia while looking at a crush mount of a stem. I don’t think these are caulocystidia, just some collapsed stipe elements. 400x
315432
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The closest thing that I could find to caulocystidia while looking at a crush mount of a stem. I don’t think these are caulocystidia, just some collapsed stipe elements. 400x
315433
IMG_2216.JPG
Spores 1000x, mounted in water

Proposed Names

55% (1)
Recognized by sight: vinaceous-brown cap, reddish spore deposit, thick stem not staining reddish
Used references: North American Species of Psathyrella
Based on microscopic features: Thick-walled cystidia, hyaline spores, spore size, would help to see the caulocystidia
83% (1)
Eyes3
Recognized by sight

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
ITS sequence
By: Alan Rockefeller (Alan Rockefeller)
2016-06-27 17:13:48 PDT (-0700)

tACTTGACGCAGTTGTAGCTGGCTCCTAGGAGCATGTGCACGCTCGTCACTTTTATCTTTCCACCTGTGCACCCACTGTAGGCCTGGATATCTCTCGCTTGGTATCAAGCGGATGCGAGGATTGCCGCTGCTCTTTCTGAAAGGGAAGGCCGGCTCTCCTTGAATTTCCAGGTCTATGTTTTTCTTACACACCCCAATAGAATGTTACCGAATGTCATCAATGGGCTTATGCCTATAAAACACAATACAACTTTCAGCAACGGATCTCTTGGCTCTCGCATCGATGAAGAACGCAGCGAAATGCGATAAGTAATGTGAATTGCAGAATTCAGTGAATCATCGAATCTTTGAACGCACCTTGCGCTCCTTGGTATTCCGAGGAGCATGCCTGTTTGAGTGTCATTAAATTCTCAACCTCTTCAGCTTTTGTTGATGAGGCTTGGATGTGGGGGTTTTGCAGGTCTGCCTTAATTGTGCGGTCTGCTCCCCTGAAATGTATTAGCGGGTTGGCTTCCGTCTATTGGTGTGATAATTATCTACGCCGTGGATGGGTTTGGCTTTCAGACCAGCTTCTAACCGTCCTTTGGACAACTATTGACATTTTTGACCTCAAATCAGGTAGGACTACCCGCTGAACTTAAGCATATCAATAAGCGGAGGAAAAGAAACTAACAAGGATTCCCCTAGTAACTGCGAGTGAAGCGGGAAAAGCTCAAATTTAAAATCTGATGGTCTTTGGCCGTCCGAGTTGTAATCTAGAGAAGTGTTACCCGTGCTGGAccgt

On the hyaline spores
By: Byrain
2013-03-12 14:19:57 PDT (-0700)

I think I have been misinterpreting what Smith means by hyaline spores in KOH, maybe he means the spores are simply pale/hyaline rather then some darker shade of brown and losing their color in KOH? In many descriptions for these species smith omits what color the spores are in H2O (Despite saying how important that is in the beginning of the book…), but he made an exception for Psathyrella naucoria where he says, “very pale under the microscope as revived in H 2 0 or when fresh, in KOH becoming cocoa-gray, in Melzer’s reddish to tan”.

In this European Psathyrella key, http://bit.ly/16pTu90, when the hyaline spore option comes up for P. amarescens it says only, “Spores for a long time hyalin.”

As for the caulocystidia, I dont see any in your images either, it could of been worn off.

Pruinose stem
By: Byrain
2013-03-12 13:28:02 PDT (-0700)

This gotta have caulocystidia, what kind of sections do you make to look for caulocystidia? I never have much luck if I don’t do a scalp section…

Caulocystidia absent
By: Alan Rockefeller (Alan Rockefeller)
2013-03-12 13:23:48 PDT (-0700)

Or very scarce. I checked a few different places on several stems and only saw a couple things that could have been caulocystidia. I think they were just collapsed hyphae though.

The gills are brick red when dried.

When mounted in water the spores are nearly hyaline, but have a definite rose color along with a hint of gray. They look exactly the same when mounted in KOH.

Compare with…
By: Byrain
2013-03-12 10:31:24 PDT (-0700)

I think the Smith key leads to Psathyrella sublateritia & P. conissans, the key uses caulocsytidia to distinguish them, I think the spore size corresponds better with the former.

The spores on the stipe look pretty red to me and I don’t really like the name “Psathyrella spadicea group”, I think “Psathyrella subgenus Homophron” or “Psathyrella sect. Homophron” would be more fitting.

subg. Homophron sect. Homophron
By: Byrain
2013-03-12 10:15:55 PDT (-0700)

From the key in North American species of Psathyrella.

“1. Spores in KOH nearly hyaline and not darkening on standing. sect. Homophron.
1. Spores soon cocoa-color or darker in KOH. sect. Cystidiosae.”

Can someone tell me what lamprocystidia and leptocystidia are? :)

And Alan would you say the spore print was “more or less brick red” or “wood brown to cocoa-brown.”?

Oh, wait, I get it…
By: Douglas Smith (douglas)
2013-03-12 10:07:28 PDT (-0700)

Ok, so only one set of spore measurements, the other sets are cystidia measurements. Sorry, I see now.

Also, interesting, another Psathyrella with no clear germ pore, and rather lightly pigmented spores. Wonder if you can group such species into a good section?

What…
By: Douglas Smith (douglas)
2013-03-12 10:03:43 PDT (-0700)

What reagents/stains are you using? Could you make note for the photos so one can better understand the colors, if they are coming from the tissues or from a stain?

What are the spore size numbers that you are quoting? It would be good to know the ave. length and width, and the stnd. of the sizes for each. Actually I think I am a little more confused, why two different sets of spore measurements?

Pleurocystidia
By: Alan Rockefeller (Alan Rockefeller)
2013-03-12 10:00:32 PDT (-0700)

Yes, the pleurocystidia are thick walled.

Pleurocystidia
By: Byrain
2013-03-12 09:13:44 PDT (-0700)

are thick walled? If yes, I guess this could be in something in subgenus Homophron.

Created: 2012-09-24 12:08:29 PDT (-0700)
Last modified: 2016-09-01 18:21:14 PDT (-0700)
Viewed: 113 times, last viewed: 2016-10-25 13:55:55 PDT (-0700)
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