Observation 222912: Coprinopsis cordispora (T. Gibbs) Watling & M.J. Richardson
When: 2015-11-14
Who: zaca
No herbarium specimen

Notes: Growing on dung.


New Photos.
Microscopy: Spores;
Microscopy: Veil – globose elements;
Microscopy: Veil – elements of other forms;
Microscopy: Laminar trama and basidia;
Microscopy: Cheilocystidia – 1;
Microscopy: Cheilocystidia – 2.

Proposed Names

29% (1)
Recognized by sight
58% (1)
Eye3 Eyes3
Used references: Flora Agaricina Neerlandica, Vol. 6
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Microscopy added.
By: zaca
2015-11-17 12:11:05 PST (-0800)

Recently I found another Coprinopsis on dung (see observation 222912). At first sight in the field the features were similar. However, as time passed, some differences arise, namely the veil was powdery and formed some conical flocks at the margins and at the center of pileus, very pale pinkish/light brown. Going to microscopy, there was no doubt it was very much different:
- The spores are rectangular ellipsoid with conical papila (heart shaped) with the following dimensions:
(9.2) 9.3 – 11.5 (11.9) x (6.2) 7 – 8.9 (9.3) µm; Q = (1.1) 1.2 – 1.5 ; N = 22; Me = 10.3 × 7.8 µm ; Qe = 1.3.
- The cheilocystidia are big mainly subglobose to utriform, but there are some small ones intermixed;
- The veil are made of mainly globose to subglobose cells, somewhat granular but not warted (needle-shaped) as in C. stercorea, with some hyphae ending as large fusiform cells and some cystidia like shape (utriform, oblong).
Consulting the key for the genus Coprinus in Flora Agaricina Neerlandica (online version available at http://www.grzyby.pl/...), in the “Key to the Sections and Subsections” I made the following evolution:

1. Pileus with veil, without setules or setae.
4. Veil at least in part consisting of (sub)globose elements; section Veliformes
8. Fruit bodies very small to small, …
10. Elements of veil smooth or with crystals that easily dissolve in HCl; spores without episporium; subsect. Nivei Citerin emend.Uljé & Noordel.

I didn’t perform the HCL test, but seemed to be the best choice, taking into account the above mentioned differences for C. stercorea. Proceeding to the “Key to the species in Subsection Nivei”:

1. Av. length of spores < 12 µm
4. Spores differently shaped (from oval or ellipsoid)
16. Ring absent
17. Cheilocystidia in part lageniform. On dung: C. cordisporus =Coprinopsis cordispora.

Created: 2015-11-14 12:51:24 PST (-0800)
Last modified: 2015-11-17 12:09:35 PST (-0800)
Viewed: 47 times, last viewed: 2016-10-24 21:08:14 PDT (-0700)
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