Observation 102730: Caloplaca citrina (Hoffm.) Th. Fr.

When: 2012-07-22

Collection location: Lourinhã, Portugal [Click for map]

Who: zaca

No specimen available

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Thanks, Jason, for all …
By: zaca
2012-07-27 00:29:34 CEST (+0200)

the details about the possibilities, to which I have no access.

Yes, about those apothecia…
By: Jason Hollinger (jason)
2012-07-26 23:07:18 CEST (+0200)

According to wetmore’s paper on the C. citrina group in North America, C. citrina “occasionally” has apothecia, while they are rare to unknown in the other three members (C. chrysodeta, C. tominii and C. xanthostigmoides). So you’re probably right that your specimen’s abundant apothecia is probably significant.

Interestingly, the British Flora says apothecia are “frequent” on C. citrina. Maybe this is just another example, like C. saxicola, where the European and American material simply looks different.

C. flavocitrina also has “frequent” apothecia; it’s greatest difference is apparently that it is only 10-50% sorediate, and the soredia are finer and paler/yellower than the thallus, while C. citrina is 100% sorediate with slightly coarser soredia that are the same color as the “green-yellow” thallus. Also, in C. flavocitrina, the (thalline) margin of the apothecia is not sorediate as it is in C. citrina.

(C. obliterans also is reported to have only “rare” apothecia.)

Another thing I wonder about, in your photo, it looks like there are some non-sorediate lobes present. I was under the impression that C. citrina was entirely leprose.

I can’t believe the BLS still hasn’t gotten your copy of the British Flora to you yet! Sigh. It’s worth the wait, though. It is an excellent work. Much better than the Sonoran Flora, for example. But it does leave you with some mysteries still, because it doesn’t cover all of Portugal’s flora!

But in the end, for this observation, C. citrina is undoubtedly the best of the names we’ve discussed.

Can’t this be due to exposure?
By: zaca
2012-07-26 22:32:12 CEST (+0200)

The question is that I didn´t found alternative. Talking about those you mentioned coming from British Flora (which I still don’t have):
- The photos I saw in Ways of enlichenment of C chrysodeta seems to be completely different from this specimen, at least does’t have apothecia;
- According to lastdragon C flavocitrina “differing (from C. citrina and as the name suggests) in the areoles typically being more greenish yellow, with bright yellow soredia forming initially at the areole margins …”;
- C. obliterans seems to have different interpretations (compare the photos in Sharnoff photos with those in Stridvall); In either case no apothecia is present.

Color seems wrong
By: Jason Hollinger (jason)
2012-07-26 21:26:42 CEST (+0200)

But I have no better suggestion. I’m used to C. citrina being very bright yellow (like the photos on Stridval, etc.) Some other options taken from British Flora are: C. chrysodeta, C. flavocitrina, C. obliterans, but none of these look promising either. The “soredia” on yours also look too coarse and isidioid.

Created: 2012-07-25 20:04:03 CEST (+0200)
Last modified: 2012-07-25 20:04:06 CEST (+0200)
Viewed: 28 times, last viewed: 2017-06-13 16:09:19 CEST (+0200)
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