Growing on the stones of a fence.
Thallus: crustose, continuous, + / – cracked, delimited; prothallus: white, felty;
Surface: silver-gray/bluish/greenish, corticate;
Photobiont: a green alga (up to 13 µm in diameter);
Ascomata: apothecial, round, immersed in thalline verrucae;
Paraphyses: mostly simple, but slightly branched, filiform;
Asci: cylindrical-ellipsoid, I+ blue (at least the outer sheet), 1-spored (maybe 2-spored is possible); 6 measured in the range 164 – 220 × 36 – 48 µm;
Ascospores: muriform, 131 × 29 (just one found).
I think this fits well in the description given in CNALH for the genus Phlyctis. The best known species is P. argena, which in this case is ruled out by several reasons: is sorediate, usually without apothecia, different chemistry, etc. Other less known species is P. aegelea, that I found recently (see observation 93689), and usually is found on bark. I think P. agelaea can also ruled out, at least by having a different chemistry. These two species exhaust the portuguese checklist. Some other species that I saw cited can also be ruled by means of their distribution: P. speirea and P. ludoviciensis. There is another one, P. petraea, which seems to be a good candidate, at least judging from the photos I saw in Enlichenment, but I know nothing about its distribution.
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Created: 2012-05-28 14:58:43 CDT (-0500)
Last modified: 2012-05-29 05:09:21 CDT (-0500)
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