Observation 49008: Caloplaca Th. Fr.
When: 2010-07-24
Who: zaca
No herbarium specimen

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Definitely Caloplaca then
By: Jason Hollinger (jason)
2010-07-25 16:42:48 COT (-0500)

That’s neat. The Sonoran Flora suggests that other sorediate Caloplaca can also appear essentially leprose, e.g., Caloplaca citrina.

So, probably wrong.
By: zaca
2010-07-25 15:40:39 COT (-0500)

I made the K test and the reaction was imediate and very strong, almost black. I upload a photo with it. According to you table this means that probably Coloplaca is more suitable and, in particular, C. chrysodeta.
Thanks, Jason, for alert about the various possibilities.

Thanks, Jason, for your comments.
By: zaca
2010-07-24 15:45:34 COT (-0500)

I will perform the chemical tests next time (I know where it is).

probably right
By: Jason Hollinger (jason)
2010-07-24 15:06:42 COT (-0500)

But note that there are two other unrelated groups:

Chrysothrix spp. - K (calycin or pinastric acid)
Candelariella spp. — K+ weak reddish (calycin)
Caloplaca spp. — K+ strong wine-red (anthraquinones)

While all Chrysothrix are “leprose” (entirely composed of soredia), the other two genera are generally not. However there are at least one or two species of both that are leprose, e.g., Candelariella efflorescens and Caloplaca chrysodeta. It is possible that there is only one species of each growing on bark in your region, making a definitive ID possible.

(I just read in Brodo 2001 that Psilolechia lucida can also form leprose thalli on rocks.)

Created: 2010-07-24 14:17:00 COT (-0500)
Last modified: 2010-08-14 13:38:49 COT (-0500)
Viewed: 39 times, last viewed: 2016-03-24 04:10:42 COT (-0500)
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