Observation 123283: Coprinopsis lignicola Rockefeller nom. prov.

Growing near coast live oak debris.

Cheilocystidia clavate to utriform, 33 – 52 × 11 – 18. (8 measured)

Pleurocystidia absent.

Spore measurements:

7.5 [8.9 ; 9.5] 10.9 × 4.4 [5 ; 5.2] 5.8 µm
Q = 1.5 [1.7 ; 1.9] 2.1 ; N = 32 ; C = 95%
Me = 9.2 × 5.1 µm ; Qe = 1.8

9.94 5.01
10.20 5.51
9.42 5.24
9.15 5.19
9.60 5.09
11.26 6.64
10.29 4.87
8.55 4.56
9.86 4.91
10.21 5.07
9.70 5.02
8.03 5.28
9.76 5.29
10.05 5.06
8.65 5.21
9.15 5.01
8.92 5.15
8.31 4.53
9.85 5.10
7.54 4.82
8.93 4.77
9.56 5.30
8.13 4.90
8.16 5.10
8.23 4.83
9.81 4.98
9.36 5.68
9.54 5.28
9.05 4.97
7.96 5.11
8.82 5.16
8.03 5.15


Spores 1000x
Spores 1000x with measurements
Cheilocystidia 400x (crush mount)
Cheilocystidia 400x (from a gill edge laying flat)
Cheilocystidia 1000x crush mount stained with crystal violet
Cheilocystidia 1000x crush mount stained with crystal violet
Cheilocystidia 1000x crush mount stained with crystal violet
Cheilocystidia 1000x crush mount stained with crystal violet

Proposed Names

-20% (2)
Used references: North American Species of Psathyrella page 100
56% (2)
Recognized by sight
28% (1)
Recognized by sight
Used references: North American species of Psathyrella
Based on microscopic features: hyaline spores

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
The spores don’t match.
By: Byrain
2013-03-18 12:20:04 CDT (-0400)

Assuming Smith’s spore description & illustrations are not completely inaccurate. It does seem close to P. uliginicola outside of the spore info.

Edit: Also, I don’t really like the sect. Fragilissimae key, take a look at the group of species surrounding P. longipes for an example. I posted about the problems here – http://mushroomobserver.org/name/show_name/105?q=18dV2

He also fails to properly mention the hyaline spores of P. luteopallida in that key, but he includes that feature in the sect. Candolleana key which its not included in. That species would also account for why many spores are small enough to key into sect. Candolleana.

Why not P. ulignicola?
By: Alan Rockefeller (Alan Rockefeller)
2013-03-18 04:04:04 CDT (-0400)
Not Psathyrella uliginicola. (Edited)
By: Byrain
2013-03-16 21:09:18 CDT (-0400)

First, I think I was wrong about the spores fading in KOH, rather I think Smith meant the spores are just hyaline in KOH rather then darker as most Psathyrella spores are which includes P. uliginicola. Though, there is P. luteopallida in the subgenus Candolleana key with hyaline spores that matches this collection microscopically. However Smith’s described it from only the type & his measurements indicate a smaller species, though maybe he measured dry specimens?

I will post some of my own micro images of this collection when I have some more time.

Edit: There are only two species described in Smith’s Psathyrella book in subgenus Candolleana with hyaline spores & without a distinct germ pore. P. singerii with “Hyphae of subcuticular region of pileus bright rusty brown in KOH” + smaller spores & P. luteopallida. We can rule out the former right away and P. uliginicola should have a visible germ pore in addition to the darker spores, look at Smith’s illustration of the spores on page 460 (or 466 in my pdf).

Also, despite the current obs name, Psathyrella luteopallida, I personally prefer calling this just Psathyrella. :)

By: Alan Rockefeller (Alan Rockefeller)
2013-02-07 13:05:32 CST (-0500)

The spores are the same color in H2O – nearly hyaline. In melzers they are light yellow. Some of the spores are longer than 10 and some are shorter.

If the spores are mounted in KOH (Edited)
By: Byrain
2013-01-25 14:22:35 CST (-0500)

I would be even more doubtful, P. uliginicola should have spores “in KOH sordid cinnamon to pale cocoa-color but soon with a dark-chocolate cast” that measure “10-12 (-15) x 5-6”. With these smaller nearly hyaline spores it does not match P. uliginicola microscopically nor does it key into the right section… In subgenus Candolleana section Candolleana there are species with hyaline spores in KOH, but I am not sure this matches any of the ones Smith mentions.

Could you compare the spores in H2O and melzers? It may be helpful.

Here is the key for the sections for subgenus Candolleana.

“1. Spores 5-10 µ long (see P. proxima also). sect. Candolleana.
1. Spores (9-)10-12 µ or more long. sect. Fragilissimae.”

Edit: Macroscopically, P. uliginicola is described to have fibrils on the cap margin from an rudimentary outer-veil, but Smith fails to mention that they are distinctly pigmented or on the cap apex which is odd since he uses such features. Failing to mention the color makes me think they could be pallid like many other Psathyrella spp.

Spores are mounted in KOH
By: Alan Rockefeller (Alan Rockefeller)
2013-01-25 11:20:30 CST (-0500)

You can see the spore print on the stem, they are brown in deposit.

The microscopic and macroscopic features matched Psathyrella uliginicola perfectly.

Nice obs.
By: Byrain
2013-01-24 15:06:24 CST (-0500)

and micro, but again, these pale spores are not what is described for P.uliginicola (it is also not a typical color for Psathyrella spores) and with that spore size I would of keyed this into Smith’s section Candolleana rather then sect. Fragilissimae. Though, I can’t come up with a better name for this either, but my opinion is that its best to not call this P. uliginicola until it can be proven to actually be so. I guess this might require a look at the type?

And did you use H2O or KOH for the spore mounts? The lack of pigment of these spores in at least two collections is interesting. :)

Created: 2013-01-24 14:17:14 CST (-0500)
Last modified: 2016-08-30 19:14:11 CDT (-0400)
Viewed: 158 times, last viewed: 2018-02-11 22:04:22 CST (-0500)
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