Observation 64114: Heterodermia casarettiana (A. Massal.) Trevisan

When: 2011-02-26

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

Who: Vitaly Charny (vcharny)

No specimen available



Proposed Names

28% (1)
Recognized by sight: orangish coloration, despite being on rock

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
casarettiana vs obscurata
By: Jason Hollinger (jason)
2011-03-06 15:48:58 CST (-0500)

Aside from the things we’ve already talked about:

casarettiana – most common one on rock
obscurata – brownish-orangish coloration in older parts

And the difference in the underside (never visible in photos):

casarettiana – yellowish in places, but pigment where present K-
obscurata – “uniformly orangish” with pigment being K+r

There also seems to me to be a difference in lobe shape:

casarettiana – flatter and more squared-off
obscurata – more convex and a bit flaring

See if you notice that, too.

It would be ideal to take two photos of each of these, one like this, then pry up a few lobes in an inconspicuous place, and take another photo with some of the underside showing. That would give us some independent verification of these subtle characters we’re trying to force into service in lieu of the “proper” characters to use: pigmentation and texture of underside. I feel like I’m finally beginning to make sense of these photos from above, but I can’t help wondering if it’s all just wishful thinking without confirmation, at least occasionally.

Created: 2011-03-06 13:19:25 CST (-0500)
Last modified: 2015-04-27 16:55:14 CDT (-0400)
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