Observation 119603: Coprinopsis P. Karst.
When: 2012-12-10
Herbarium specimen reported

Notes: Growing in the wood chip park where Thompson ave. dead ends, near 5lowershop.

Extremely fragile cap and stem.

Spores milk chocolate brown in deposit, 11 – 12 × 6 – 7.

Cheilocystidia utriform, 50 – 60 × 8 – 19.

Pleurocystidia absent.

Lamellar trama parallel.

Images

292071
IMG_9515.JPG
292064
IMG_9499.JPG
292065
IMG_9500.JPG
292066
IMG_9502.JPG
292067
IMG_9505.JPG
292068
IMG_9506.JPG
292069
IMG_9510.JPG
292070
IMG_9513.JPG
292072
IMG_9516.JPG
292073
IMG_9521.JPG
292074
IMG_9523.JPG
292075
IMG_9525.JPG
292076
IMG_9526.JPG
292077
IMG_9527.JPG
292078
IMG_9530.JPG
292079
IMG_9531.JPG
292080
IMG_9532.JPG
292081
IMG_9534.JPG
292082
IMG_9538.JPG
292083
IMG_9546.JPG
Pileus cross section 40x
292084
IMG_9548.JPG
Pileus cross section 100x
292085
IMG_9549.JPG
Cheilocystidia 100x
292087
IMG_9553.JPG
Lamellar trama 400x
292088
IMG_9554.JPG
Pileipellis 400x
292089
IMG_9555.JPG
Pileipellis 400x
292090
IMG_9556.JPG
Pileipellis setae 400x
292091
IMG_9557.JPG
Pileipellis 400x
292092
IMG_9542.JPG
Spores 1000x
292093
IMG_9550.JPG
Cheilocystidia 400x

Proposed Names

-28% (1)
Recognized by sight
Used references
Based on microscopic features: P. uliginicola has non-hyaline spores with a visible germ pore.
55% (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
Spores
By: Alan Rockefeller (Alan Rockefeller)
2012-12-12 10:50:39 CST (-0500)

I mounted the spores in water. They are slightly brown under the microscope. I think Douglas’s collection is the same species.

Douglas
By: Byrain
2012-12-11 16:53:40 CST (-0500)

I think your obs could be the same as Alan’s, cystidia can often be variable in Psathyrella, I think the apex less so (Acute vs. broadly rounded), but the pale spores only makes me doubt P. uliginicola more…

Do you recall if you saw many spores or only a few? (Were they mature spores? Immature spores could be hyaline.) P. uliginicola should have tawny spores in melzers, could yours be mounted in KOH? That could explain the lack of pigment which some species lose in KOH, P. uliginicola shouldn’t do this, at least quickly. Smith recommends looking at all Psathyrella spores in H2O, KOH, and melzers and says you can often predict the color in melzers after seeing it in KOH. Although I have no idea how yet.

Not sure…
By: Douglas Smith (douglas)
2012-12-11 16:19:54 CST (-0500)

These don’t agree that well with my details from a similar obs:

http://mushroomobserver.org/6789

But I was never convinced that one was P. uliginicola. The cystidia in mine seem much more inflated, and I didn’t clearly see any cellular layer in the cap surface. But the spores actually look fairly close if nothing else. As a suggested Psathyrella that has relatively thin-walled spores that seem to be laking a germ pore.

Spores?
By: Byrain
2012-12-11 14:33:54 CST (-0500)

The spores in your pictures still look very pale to me, if not hyaline, how would describe their color under magnification? To me it looks distinctly different from what is described. And okay, I won’t ask how many were measured, all I will add to that is a confident spore size can help with Psathyrella identification a lot, as can knowing what they were mounted in.

As for the habitat, P. uliginicola is described as, “Solitary in swampy areas under brush or on decayed wood of aspen, especially around beaver ponds.” from, “Idaho, New Mexico, Utah, Wyoming.” He saw a few collections as well, I think collections from CA deserve extra attention.

I looked at the Smith book a lot more now that I am not tired, I don’t think any of the species except P. uliginicola could fit, but I am not sure the spore details match, would be really nice to know more about your interpretation of them. :)

And I don’t doubt they were fragile, the P. larga I found last year in the mountains were also quite fragile despite the large size. Lastly, I think you should contact Jonathan Frank about this collection, he may be interested in doing more work with them.

spores
By: Alan Rockefeller (Alan Rockefeller)
2012-12-11 05:57:16 CST (-0500)

> Are the spores hyaline?

No.

> Mounted in KOH?

> Smith didn’t consider the latter ones to be taxonomically significant.

I wouldn’t either.

> but the key doesn’t really convince me of any particular id.

Yea me too.

> It would help to know how many spores were measured,

I am not going to tell you that. More than 5, less than 30.

> are they always 6 or more wide in the broadest view?

6 – 7

> If yes, that may rule out P. uliginicola, at least it would key out to something different. The location and habitat aren’t very convincing either…

They were growing in wood chips.

> Also, its interesting to know that the type species of this section, P. fragilissima (aka P. marcescibilis) is now known as Coprinopsis marcescibilis. :)

These are extremely fragile, more so than you would ever believe.

Hyaline spores?
By: Byrain
2012-12-11 01:04:43 CST (-0500)

Are the spores hyaline? Mounted in KOH? Some Psathyrella species have spores that turn hyaline quickly in KOH, some do so over a greater period of time. Smith didn’t consider the latter ones to be taxonomically significant. P. uliginicola spores should be “sordid cinnamon to pale cocoa-color but soon with a dark-chocolate cast” in KOH. I think this should key out to Subgenus Candolleana Section Fragilissimae where P. uliginicola is located, but the key doesn’t really convince me of any particular id.

It would help to know how many spores were measured, are they always 6 or more wide in the broadest view? If yes, that may rule out P. uliginicola, at least it would key out to something different. The location and habitat aren’t very convincing either…

Edit: Also, its interesting to know that the type species of this section, P. fragilissima (aka P. marcescibilis) is now known as Coprinopsis marcescibilis. :)

Created: 2012-12-10 21:59:51 CST (-0500)
Last modified: 2016-02-17 00:18:47 CST (-0500)
Viewed: 152 times, last viewed: 2016-10-21 11:54:39 CDT (-0400)
Show Log