Observation 96963: Arthonia pruinata (Pers.) A.L. Sm.
When: 2012-06-09
Who: zaca
No herbarium specimen

Notes: Average dimensions of the spores: Me = 14.4 × 5.5 µm ; Qe = 2.6 (N=31).

Proposed Names

47% (2)
Eye3
Based on microscopic features
Based on chemical features
56% (1)
Eyes3
Used references: British Flora
Based on microscopic features: hyaline (3)4-5-septate spores with one end scarcely larger than other, 13-22×4.5-7µm
Based on chemical features: C+ red

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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And it might not be!
By: Jason Hollinger (jason)
2012-06-11 03:21:29 EEST (+0300)

This is just how it keys out in the British Flora. As you well know, it could be some other species not covered. The C+ red test looks pretty unusual, though. And everything but the pruina seems to match. (Although, I was mildly surprised to learn they say that these spores are not wider on one end than the other. I guess it’s a matter of degree. But I certainly see a few spores with one end bigger than the other. …And many not, too, admittedly!)

This specimen …
By: zaca
2012-06-11 02:55:03 EEST (+0300)

didn’t seem so pruinose as others that I saw with this classification. Thus, I didn’t consider A. pruinata as a possibility. Thanks, Jason.

Created: 2012-06-11 00:37:30 EEST (+0300)
Last modified: 2012-06-11 02:07:15 EEST (+0300)
Viewed: 57 times, last viewed: 2016-11-04 11:50:33 EET (+0200)
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