Observation 65516: Caloplaca flavovirescens (Wulfen) Dalla Torre & Sarnth.
When: 2011-04-10
Who: zaca
No herbarium specimen

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Now is clear!
By: zaca
2011-04-14 18:24:10 CDT (-0500)

I understood your point of view and, therefore, your previous statement.

Let me be more precise!
By: Jason Hollinger (jason)
2011-04-14 18:02:09 CDT (-0500)

C. citrina is sorediate, I don’t have info on the other two. Let me make the statement more precise then: (according to the Sonoran key…)

Start with rock-dwelling Caloplaca with visible, non-lobed, non-gray thallus (group G in Wetmore’s key), then:

sorediate – several species split off
squamulose – a few more species split
thallus of scattered tiles – yet more species
apothecia immersed – even more species
thallus with a white outline – C. rosei
thallus thick – C. bolacina
thallus orangish – C. ludificans

Phew! This leaves just C. flavovirescens. :)

Thus, “thin, yellowish, indeterminant” should strictly be emended to include “non-sorediate”, “continuous” and “non-immersed apothecia” – I just tend to think of these three things as being “normal”. Anything with soredia, or dispersed areoles, or immersed apothecia would immediately raise all sorts of flags for me as being “interesting”. Make yourself a “model” for the genus – you know, like “lobed or continuous orange crust with orange-rimmed orange apothecia” – then every species start with this model and modifies it in one or more ways. This model is sort of the “center” or maybe “average” which everything is comparable to.

(By the way, similar keys in the Ozarks and elsewhere make it even easier to arrive at flavovirescens. It appears to be a cosmopolitan species, and not even particular about the kind of rock it grows on.)

Quoting Jason
By: zaca
2011-04-14 17:31:55 CDT (-0500)

“I think all Caloplaca with indeterminant thin yellowish crust are C. flavovirescens.”
What about C. citrina, C. flavocitrina and C. maritima (and, perhaps, others)?

This seems to be a safe species
By: Jason Hollinger (jason)
2011-04-14 17:24:43 CDT (-0500)

I think all Caloplaca with indeterminant thin yellowish crust are C. flavovirescens. (And that covers an amazing amount of variation!) The lobed ones and endolithic ones, however, get trickier.

Created: 2011-04-14 17:03:54 CDT (-0500)
Last modified: 2011-04-14 17:19:26 CDT (-0500)
Viewed: 24 times, last viewed: 2016-10-22 15:34:39 CDT (-0500)
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