Observation 108526: Anaptychia palmulata (Michaux) Vainio
When: 2012-08-06
Herbarium specimen reported

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18% (2)
Recognized by sight

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Eye3 = Observer’s choice
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Jim Bennett returned ID Anaptychia palmulata
By: Andrew Khitsun (Andrew)
2014-07-01 00:44:25 EDT (-0400)
I don’t think we have a choice
By: Jason Hollinger (jason)
2012-09-04 16:23:56 EDT (-0400)

This has to be Anaptychia then, despite the (pseudocorticate?) ecorticate lower surface. Remember your Physcia aipolia with the black squarrose rhizines? Well, maybe your Anaptychia sometimes blackens below as well?

Just wanted to confirm:
By: Andrew Khitsun (Andrew)
2012-09-04 15:27:57 EDT (-0400)

K- on everything (thallus and medulla) – doesn’t even cause darkening I sometimes confuse with color change. Rhizines are brown to black (not white), simple to splitting (not squarroze). ???

Good point
By: Jason Hollinger (jason)
2012-09-04 01:22:03 EDT (-0400)

Hinds & Hinds clearly state that Anaptychia palmulata is corticate, and all my photos of the underside clearly show unambiguously corticate lower surface. And simple white rhizines. Heterodermia hypoleuca almost always has conspicuous squarrose black rhizines in my specimens (but northern material may be different).

I would still do the K test to be absolutely sure. This sure looks more like Anaptychia to me. Not the first time I’ve been wrong, though…

By: Andrew Khitsun (Andrew)
2012-09-03 21:26:58 EDT (-0400)

The reason I thought it was Heterodermia – it appears to be ecorticate below. I took another look – it appears woolly, with a network of rhyzohyphae? covering white surface in slightly darker pattern. But the surface is pretty firm to a touch by needle.

By: Jason Hollinger (jason)
2012-09-03 21:13:37 EDT (-0400)

Looks K-. You can give Phaeophyscia americana a shot, too… err, no, it would be pretty far from home! :)

Using keys in Thomson looks like Heterodermia hypoleuca – esorediate, lower surface ecorticate
By: Andrew Khitsun (Andrew)
2012-09-03 21:08:54 EDT (-0400)

But the rest of the features don’t match: K- on both thallus and medula, rhizines appear to be not squarrose (at least on the outlying margins – toward the center they’re heavily matted).

Created: 2012-09-03 21:03:37 EDT (-0400)
Last modified: 2014-07-01 00:43:48 EDT (-0400)
Viewed: 45 times, last viewed: 2017-06-14 01:20:37 EDT (-0400)
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