Observation 49653: Lecanora Ach.

When: 2010-08-04

Collection location: Parque de Monsanto, Lisboa, Portugal [Click for map]

Who: zaca

No specimen available

In the reference given I found some similar species in Lecanora, e.g. L. allophan, L. caesiosora, L. cinisia, L. pulicaris, just to mention some, but I was not able to find a reference for their chemical reactions. However, the very strong C+red reaction (shown in the 1st photo) is not so common and must be a distinguish feature of some particular species or group of species.
This specimen lives in a oak tree.



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Thanks, Jason, for the hint.
By: zaca
2010-08-08 04:47:15 CST (+0800)

In the portuguese paper by P. Carvalho et al., Portugaliae Acta Biol. 20:225-24 (2002), available at here is mentioned that the species Lecanora lividocinerea (as is written there) was found in the west atlantic coast of the south (Sines area) while before is was only referred in Algarve (extreme south of the country). Unfortunately, there where no other details about that species and I couldn’t find in internet anything else that deserves to be mentioned.
Please pass to Curtis Björk my acknowledgment for his contribution.

By: Jason Hollinger (jason)
2010-08-08 03:45:23 CST (+0800)

This from Curtis Björk:

“The C+ Lecanora keys in Clauzade & Roux 1985, Likenoj de Oksidenta
Europo (Lichens of Western Europe) to L. livido-cinerea. I don’t know
that species, but it’s the only corticolous species in the flora
having a C+ red reaction and a white thallus.”

Thank you both for your interest.
By: zaca
2010-08-06 06:09:12 CST (+0800)
By: Chris Parrish (kitparrish)
2010-08-06 05:48:35 CST (+0800)

forgot about the oak tree :-)

interesting idea
By: Jason Hollinger (jason)
2010-08-06 05:34:52 CST (+0800)

The C+r Rhizoplaca do contain lecanoric acid. Oh no, but Rhizoplaca wouldn’t be caught dead on an oak. Nice try!

Curtis says species of Lecanora with lecanoric acid (the resemblance is not accidental) might not be uncommon, but might not be restricted to any one group. Hopefully he’ll get a chance to look at the observation later.

By: Chris Parrish (kitparrish)
2010-08-06 05:26:21 CST (+0800)

Does this look at all like Rhizoplaca? In North America, both Rhizoplaca chrysoleuca and R. melanophthalma can be C+ red when they contain certain acids (Brodo, 2001, pp.639-640). This checklist of the lichens of Spain lists four species of Rhizoplaca for Spain, including those two, so it may be something to think about.

no, I agree with Lecanora
By: Jason Hollinger (jason)
2010-08-06 04:49:45 CST (+0800)

I don’t see any species in North America that match, but that certainly doesn’t mean there’s not one in southwest europe. I’ll ask Curtis Björk what he thinks.

Thanks, Jason.
By: zaca
2010-08-06 03:28:31 CST (+0800)

Do you see any alternative (I mean outside Lecanora) for classification?

very few Lecanora are C+r
By: Jason Hollinger (jason)
2010-08-06 02:46:01 CST (+0800)

I can only find three: L. novomexicana (an effigurate species growing on rocks in the desert), L. pringlei (a bizarre black alpine thing mistakable for nothing else), and Brodo talks about a parasite Rimularia insularis causing some weird synergistic effect with L. rupicola to make a C+r reaction. There are lots of species of Lecanora with various xanthones, but to my knowledge they are all C+ yellow to orange, although I see some described as “C+ orange-red”. Xanthones tend to be found only in subtropical and tropical species, and you are definitely far enough south to expect to find them frequently. Interesting, but not so helpful in the final analysis…

Created: 2010-08-05 18:14:36 CST (+0800)
Last modified: 2010-08-15 02:38:57 CST (+0800)
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