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)
Based on microscopic features
Based on chemical features
56% (1)
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


Add Comment
And it might not be!
By: Jason Hollinger (jason)
2012-06-11 01:21:29 BST (+0100)

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 00:55:03 BST (+0100)

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: 2012-06-10 22:37:30 BST (+0100)
Last modified: 2012-06-11 00:07:15 BST (+0100)
Viewed: 59 times, last viewed: 2017-07-11 06:17:29 BST (+0100)
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