Observation 235447: Lecanora Ach.

Notes:
Host is Fraxinus dipetala (ash).

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Proposed Names

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Recognized by sight
56% (1)
Recognized by sight

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As usual Jason
By: James Bailey (Silversea_Starsong)
2016-03-27 20:11:11 EDT (-0400)

I’m going by the checklist. Certainly I live off that thing far too much though :)
Not a good habit…

The key character for L. circumborealis
By: Jason Hollinger (jason)
2016-03-27 14:17:53 EDT (-0400)

is the extremely thickened cortex on the basal part of the rims. My problem is every time I see a Lecanora with black disks it turns out to be something else. So I just urge caution. This could well be an unusually dark L. pulicaris, for example. There’s also something called L. meridionalis with particularly dark disks. Even Tephromela atra is a remote possibility.

Was going to say
By: James Bailey (Silversea_Starsong)
2016-03-27 13:11:52 EDT (-0400)

we have circumborealis with black apothecia. So few Lecanora on bark here so it seems like a reasonable option indeed.

Unusually black disks for Lecanora
By: Jason Hollinger (jason)
2016-03-27 04:10:26 EDT (-0400)