Observation 76343: Flavoparmelia caperata (L.) Hale
When: 2011-08-17
Who: zaca
No herbarium specimen

Notes: Again some identification problems with the specimen that seems to me to have the appearance of a Flavoparmelia. With such granular soredia could be F. caperata. But, the existence of so marked (sharp, visible) ridges on the upperside of lobes makes me doubt. Another question is: what are the “big” black rounded structures that one can see on the lobes? Pycnidia?

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Based on chemical features: C-, K+y on thallus

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Yes, I think they are
By: Jason Hollinger (jason)
2011-09-16 00:18:04 PDT (-0700)

Just do an image search on Flavoparmelia caperata. Most of the images on MO show these ridges to some extent. This one is very pronounced, for example:

Pustulate species are often ridged like this. I’d guess that they’re related: the pustules form on these ridges, possibly they are just the end result of ridges becoming overly-developed and “bursting”.

Good to know.
By: zaca
2011-09-15 11:42:05 PDT (-0700)

F. baltimorensis is out of question, because we don’t have here.
What about the ridges? are they common? This was my main point of doubt and because of it I even thought that could be another genus.

I agree with F. caperata
By: Jason Hollinger (jason)
2011-09-14 16:15:10 PDT (-0700)

Was this on bark? The soredia are not obvious to my eye, but the pustules do seem to be fragile and hollow, suggesting caperata and not baltimorensis.

The black spots could be a parasitic fungus. I don’t recall seeing pycnidia in these species, and besides they look a little to large and flat to be pycnidia, more like ink spots than bulging round structures.

Created: 2011-09-14 15:04:29 PDT (-0700)
Last modified: 2011-09-14 16:12:44 PDT (-0700)
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