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Observation 235447: Lecanora Ach.

Notes:
Host is Fraxinus dipetala (ash).

Images

Proposed Names

-1% (2)
Recognized by sight
56% (1)
Recognized by sight

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= Observer’s choice
= Current consensus

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As usual Jason
By: James Bailey (Silversea_Starsong)
2016-03-27 19:11:11 CDT (-0500)

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 13:17:53 CDT (-0500)

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 12:11:52 CDT (-0500)

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 03:10:26 CDT (-0500)