When: 2017-11-19

Collection location: Serra de São Mamede, Portugal [Click for map]

Who: zaca

No specimen available

Growing on bark (Fraxinus).


Microscopy: Apothecial section (x100, in water);
Microscopy: Apothecial section (x100, in KOHr);
Microscopy: Excipular zone (x400, in water and in KOH);
Microscopy: Nostoc chains under the hymenium (x400, in KOH);
Microscopy: Apothecial section – close ups (x400, in 3 mounting media);
Microscopy: Hymenium views (x400, in CBLA);
Microscopy: Asci (x400, in CBLA);
Microscopy: Asci and spores (x1000, in CBLA).

Proposed Names

29% (1)
Recognized by sight
58% (1)
Recognized by sight
Based on microscopic features

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= Observer’s choice
= Current consensus


Add Comment
C. nigrescens and C. subnigrescens
By: zaca
2017-11-26 13:41:31 CST (-0500)

differ mainly in the dimensions of the spores (values are 50-90 x (2,5-)3-4 µm for the former and (35-)40-75 x (4-)4,5-6 µm for the latter). The first species can sometimes present globose isidia and the second one lacks isidia.
Taking into account that this specimens lack isidia and that the biggest spores observed have dimensons of 54 × 4,5 µm, I think that the best choice is Collema subnigrescens.

Created: 2017-11-26 06:54:06 CST (-0500)
Last modified: 2017-11-26 13:39:42 CST (-0500)
Viewed: 26 times, last viewed: 2019-09-05 05:05:45 CDT (-0400)
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