Observation 183064: Coprinus candidatus
When: 2014-10-10
Who: zaca
No herbarium specimen

Notes: Using the key in Ref.1 and taking into account the microscopy, at a first step for choosing the section/subection one arrives to
4. Veil at least in part consisting of (sub)globose elements; section Veliformes

10. Elements of veil smooth or with crystals that easily dissolve in HCl; spores without episporium; subsect. Nivei Citerin emend.Uljé & Noordel.

In the Key to species in Subsection Nivei, due to the dimensions of the spores ( length < 12 µm) one has basically two choices:
1st- Cystidia lacking, and the either 1a) Basidia: 2-spored, which leads to C. bellulus,
or 1b) Basidia: 4-spores, which leads to C. cortinatus;
2nd – Cystidia present.
I must confess that , in spite of my efforts, I could not observe basidia conveniently. I observed only a few, maybe because I had to work with dry material, I was not able to reach any conclusion. Nevertheless, since the 2-spored species is just one, I ruled it out on the basis of the ratio Q for the spores.
On the other hand, since some cheilocystidia were found and pleurocystidia lacking, I proceed to point 7 of the key. Now taking into account the form of cheilocystidia, I finally reach point 13: C. candidatus.
Comparing the dimensions of the spores obtained, this species is the only one with similar values of Q.

It should also be mentioned that from the description of C. cortinatus in Ref.1:
“Cheilo- and pleurocystidia absent but here and there sterile elements (probably somewhat enlarged basidioles) projecting from lamellae and sometimes velar remnants sticking to lamellar edge…”
This means that this species can also be considered as having some sort of “cheilocystidia”. However, once again this species can also be eliminated on the basis of the ratio Q.

Finally, a note on taxonomy. I believed that the current name for this species was Coprinopsis candidata, similarly to what happened to the species in the same group in the key. However, looking to Index Fungorum, this was not the case and this species still mantains there the old name: Coprinus candidatus.

Images

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Microscopy: Veil-1;
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Microscopy: Veil-2;
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Microscopy: Pileipellis;
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Microscopy: Spores;
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Microscopy: Gill edge;
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Microscopy: Lamellar trama and gill elements.
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Habitat – the photo also shows the fruits of Arbutus unedo, very common locally.

Proposed Names

58% (1)
Eye3 Eyes3
Used references: Ref.1: Uljé Key: http://www.grzyby.pl/...
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2014-10-15 17:39:39 CDT (-0400)
Last modified: 2014-10-15 19:06:04 CDT (-0400)
Viewed: 91 times, last viewed: 2016-11-22 12:51:58 CST (-0500)
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