Observation 130841: Physcia undulata Moberg
When: 2013-03-24
Who: zaca
No herbarium specimen

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I almost forgot …
By: zaca
2013-03-25 16:14:58 PDT (-0700)

the existence of the species Physcia undulata that I found once (observation 90860). The fact is that this species is not referred neither in the portuguese or iberian checklists (to be precise, in the last one, only the name is mentioned but no reports are given) nor in the British Flora. On the other hand, the former specimen lived on bark and these on rock, which can explain the less appressed lobes. Moreover, as you pointed out, the lobes are eciliate and the K reaction is very weak. I just read again the description given in CNALH for P. undulata and everything seems to match. So, I will follow you. Thanks, Jason.

This looks more like Physcia to me
By: Jason Hollinger (jason)
2013-03-25 14:55:30 PDT (-0700)

In fact, a lot like P. undulata. If you are considering Heterodermia speciosa, then it must have a white, corticate lower surface. For whatever it’s worth, I was convinced the P. undulata in southern Florida was a Heterodermia for the longest time before J. Lendemer or R. Harris at NYBG finally identified it for me. For instance, it has an unusual K reaction in the medulla: Most Physcia are either K- or K+ pale yellow. P. undulata goes K+ yellow then turns orange or even darker as if it has stictic acid or relative in it, too, not just atranorin. (Something apparently never mentioned in the literature.) This is more typical of Heterodermia. But note that H. speciosa always has cilia — usually white, but sometimes black, especially specimens on rock it seems. It doesn’t look like yours has cilia of any color.

Created: 2013-03-25 14:19:22 PDT (-0700)
Last modified: 2013-03-25 16:47:19 PDT (-0700)
Viewed: 21 times, last viewed: 2016-10-27 16:12:52 PDT (-0700)
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