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I’m guessing this is either stictic acid or thamnolic acid. Loxospora is a common sterile epiphytic crust with well-developed whitish/grayish thallus that contains thamnolic acid. But it doesn’t look promising. I’m not sure what it could be if it’s Pertusaria. It would really be nice to see either a definite apothecium or perithecium, or a definite soralium or pustule. This specimen is some intermediate thing that could go either way. I’ve tried all my keys, and I’m just stumped. It’s not clear that P and UV would help, but having those tests would at least narrow down options (P distinguishes stictic and thamnolic acids, UV can reveal lichexanthone and maybe other accessory substances).
This was supposed to be a Pertusaria velata. Accordingly a C+ red reaction was expected, beyond a K- or K+ reaction. That was not what I observed. Ther was no C+red reaction, but the K+ yellow reaction was intense, I think the one caused by thamnolic acid. I uploaded already the photos with the new reactions and also a photo where the previous reactions on thallus are still visible. Ironically, there is some red in the KC reaction of 4 days ago. So, what is this?
This is more typical of the species.
Created: 2012-06-12 23:37:57 BST (+0100)
Last modified: 2012-06-12 23:37:59 BST (+0100)
Viewed: 52 times, last viewed: 2017-06-13 08:55:47 BST (+0100)