Collection location: Parque de Monsanto, Lisboa, Portugal [Click for map]
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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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.
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.”
forgot about the oak tree :-)
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.
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.
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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