Observation 222345: Coprinellus xanthothrix (Romagn.) Vilgalys, Hopple & Jacq. Johnson
When: 2015-11-08
Who: zaca
No herbarium specimen

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Recognized by sight
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Used references: Uljè Key for Coprinus
Based on microscopic features

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Microscopy added.
By: zaca
2015-11-13 14:09:27 PST (-0800)

I’m used to use the Uljè Key available at
to classify specimen of the former genus Coprinus, before the splitting into several genus: Coprinus, Coprinellus, Coprinopsis and Parasola.
From the date of this observation this was the single specimen of the genus Coprinellus that I found. However, it happened the same thing that the day before, where I found many other specimens in this genus: they were observed at the beginning of the field trip and, since they are very delicate and somewhat deliquescent, they were in very poor condition when the drying process started. Therefore, it was not possible to do the full microscopy and it not possible to analyze the other gill elements, beside the spores. If in some cases, like this one (I think) that information is not indispensable, for my other observations from the day before it would be convenient (see observation 222302, observation 222302, observation 222302). The reason is understandable, since going to the key mentioned above, we have:

1. Pileus with veil, without setules or setae.
4. Veil at least in part consisting of (sub)globose elements; section Veliformes [see the photos of the veil]
8. Fruit bodies medium-sized, somewhat fleshy; stipe 3-10 mm thick; pileus usually brown, never pure white; veil present in form of scattered, granulose floccules or small flocculose scales, often (partly) thick-walled and brown-pigmented under microscope; pileus conical or campanulate, long closed, only tardily expanding, never

applanate when old, not grooved, without veil at margin when young.
9. Veil breaking up in small, more persistent flocculose scales, microscopically existing of chains of fusiform, ellipsoid to globose, in part usually thick-walled cells not colouring in KOH or ammonia; subsect. Domestici Sing.

I did measured some of the veil cells and got the following dimensions:
(12.9) 16.2 – 36.8 (37.6) x (6.4) 6.5 – 12.8 (13.8) µm; Q = (1.9) 2 – 3.7 (5.2) ; N = 12; Me = 29.4 × 10.2 µm ; Qe = 3

Going to the ""Key of subsect. Domestici"", the evolution is straightforward:

1. Spores cylindric-ellipsoid, up to 12(-13) µm long; germ pore central.
2. Spore length less than 10(-11) µm.
For this specimen I got the following vallues:
(6.8) 7 – 8.5 (9.9) x (4.4) 4.5 – 5.2 (5.3) µm; Q = (1.5) 1.51 – 1.8 (2) ; N = 32; Me = 7.8 × 4.8 µm ; Qe = 1.6 [see th e photo of the spores attached]

3. Veil breaking up in small, woolly flocks (up to 2 mm diam.).
4. Spore breadth up to 4.5 µm; pileus 25-40 × 20-30 mm before expanding; usually on and around truncs C. domesticus =Coprinellus domesticus
4. Spore breadth 4.5-5.5 µm; pileus 20-30 × 15-20 mm before expanding; usually on dead branches C. xanthothrix= Coprinellus xanthotrix.

Let me also mention that the specimen was very small and even after the expansion the cap didn’t reach 3 mm. It seemed clear to me that the name of it is Coprinellus xanthotrix, for which the following values for the spores are mentioned:
“Spores 6.7—9.9 × 4.4—6.3 × 4.9-5.1 µm, QB = 1.35—1.85, av. QB = 1.45—1.65, QW = 1.55-1.75, av. QW = 1.55-1.7, av. L = 7.4—8.6 µm, av. B = 4.6—5.9 µm, av. W = 5.0-5.5 µm, ovoid or ellipsoid, in side view a few phaseoliform, with rounded base and apex, medium red-brown; germ pore eccentric, c. 1.3 µm wide.” [The dimensions are given in the form Lenght x Breath x Width]

Created: 2015-11-09 14:47:10 PST (-0800)
Last modified: 2015-11-13 14:04:57 PST (-0800)
Viewed: 16 times, last viewed: 2016-11-06 08:07:14 PST (-0800)
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