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When: 2011-09-04

Collection location: Matinha de Queluz, Sintra, Portugal [Click for map]

Who: zaca

No specimen available

In my opinion this specimen is very similar to a Flavoparmelia. Even the chemical reactions could be of a species of this genus. However, the thallus is clearly pustulate, which eliminates the existing species in this part of Europe: F. caperata and F. soredians. I’ve read that in USA there is (at least) a species with these characteristics, F. baltimorensis, but it is far from here.
What could be then? Any other genus closer, e.g. Myelochroa?


Chemical reactions and pustules crateriform breaking open apically.
Pustules observed under the microscope.

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Add Comment
Very nice.
By: zaca
2011-09-08 10:35:12 PDT (-0700)

I’m always learning!

Here’s a photo from a specimen on southern California coast
By: Jason Hollinger (jason)
2011-09-08 10:20:55 PDT (-0700)

Probably a very similar climate and habitat to yours. (Torrey Pines, specifically)

I’m amazed:
By: zaca
2011-09-08 10:04:21 PDT (-0700)

I never saw such a Flavoparmelia pustules. Take this opportunity to attach a photo of pustules under the microscope.

F. caperata can be pustulate
By: Jason Hollinger (jason)
2011-09-08 09:47:46 PDT (-0700)

You are fortunate to only have F. caperata and not F. baltimorensis. The two are extremely similar. In most cases, you are right, F. caperata looks simply sorediate, perhaps the soredia mostly originating on top of wrinkles. But in many cases you can find specimens where the soredia originate on top of fairly well-defined pustules. F. baltimorensis, on the other hand, always has irregular blobby isidia that usually look a lot like pustules but which never break down into soredia. F. baltimorensis is almost invariably found on rock. (I’ve only found it on a tree one time.) _F. caperata can be either but is typically on bark, especially in the southern part of its range. I’ve never seen it on rock in the southern Appalachians, for example.

Other pustulate parmelioids you could consider are:

Myelochroa aurulenta (cortex KC+y, medulla pale yellow and K+y/o)
Hypotrachyna spp. (conspicuously forked rhizines, squared-off lobe tips and rounded axils)
Parmelinopsis spp. (very tiny, boreal)

(am I missing any?)