When: 2017-09-09

Collection location: Oak Mountain State Park, Shelby Co., Alabama, USA [Click for map]

Who: Vitaly Charny (vcharny)

No specimen available

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Proposed Names

-28% (1)
Recognized by sight: lower surface black with short simple black rhizines
Based on chemical features: cortex contains both atranorin and usnic acid; medulla protocetraric

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= Observer’s choice
= Current consensus

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By: Jason Hollinger (jason)
2018-07-12 15:05:26 EDT (-0400)

I missed that Canoparmelia alabamensis can contain usnic acid in the cortex. Chemistry is correct, too.

Can definitely rule out Dirinaria
By: Jason Hollinger (jason)
2018-07-12 15:01:56 EDT (-0400)

It seems closest to Xanthoparmelia, but the only sorediate species in North America is X. mougeotii which has stictic acid syndrome, not protocetraric acid. And the cortex has both atranorin and usnic acid; Xanthoparmelia has usnic acid dominant, rarely with atranorin as an accessory. There are other genera which do have both dominant, such as Arctoparmelia. But that genus has alectoronic acid in the medulla, not protocetraric acid. There’s a Hypotrachyna (H. flavovirens from South America!) which has the right chemistry, but is morphologically totally different.

I’m stumped!

Not quite what I’m used to
By: Jason Hollinger (jason)
2017-11-11 13:05:44 EST (-0500)

It’s usually under overhangs in sheltered locations, and the lobes are usually fully-adnate to the surface, not loose and imbricate. But I don’t know what else this could be. The soralia are exactly right. Nice population!

Created: 2017-11-11 11:23:28 EST (-0500)
Last modified: 2018-07-12 15:05:27 EDT (-0400)
Viewed: 34 times, last viewed: 2019-09-04 03:04:10 EDT (-0400)
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