Observation 202250: Opegrapha vulgata Ach.
When: 2015-04-03
Who: zaca
No herbarium specimen

Notes: Growing on the bark of Fraxinus.

Proposed Names

-29% (1)
Recognized by sight
58% (1)
Eye3 Eyes3
Used references: British Flora
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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The microscopic observation …
By: zaca
2015-04-21 19:53:23 CEST (+0200)

… of the specimen made clear that this is an Opegrapha and not Arthonia.
The spores are elongate acicular, mostly slightly curved, 5-7 septate (or similar) with dimensions:
(21.3) 22 – 27.9 (30.4) x (2.8) 2.9 – 3.6 (4.4) µm
Q = (6.1) 6.4 – 8.2 (9.8) ; N = 20
Me = 24.6 × 3.4 µm ; Qe = 7.4
Using the key for the genus Opegrapha in the British Flores we end up with O. vulgata, name that I propose for this specimen.

Created: 2015-04-03 23:23:35 CEST (+0200)
Last modified: 2015-04-21 19:54:26 CEST (+0200)
Viewed: 38 times, last viewed: 2016-10-26 08:59:17 CEST (+0200)
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