Collection location: Papôa, Peniche, Portugal [Click for map]
I returned to the place of Observation MO65784, took new photos and collect some material. At the time of that observation I was not even sure about the genus and gave as hypotheses: Buellia and Diplotomma. Now, after looking to the spores, I can eliminate the latter, since the spores are 1-septate and species in Diplotomma have more septate, submuriform or muriform spores. On the other hand, all the other features of the spores:
- size (average dimensions: Me = 11 × 6 µm ; Qe = 1.8 (N=38)),
- form (Buellia-type),
- color (hialine when young and brow when mature)
are of a Buellia sp.
According to “page of CNALH for the genus Buellia” there are at least three very similar species with these type of spores: B. maritima, B. stellulata and B. subalbula. The chemistry and some other features permit to distinguish between at least two of them:
- B. maritima – coastal species living in substracts that contain calcium carbonate, thallus rimose to rimose-areolate, densely pruinose and contain large amounts of calcium oxalates, chemistry: K+ yellow to red (crystals), P+ yellow, C-, KC-, CK-.
- B. stellulata – living close to the coast on siliceous rock, has a distinctly areolate thallus, and its individual areoles are typically surrounded by a conspicuous black hypothallus, chemistry: K+ yellow (sometimes weak), P- or + faintly yellow, C-, KC-, CK-.
- B. subalbula – very similar to B. maritima, and some authors take these species as synonyms and here I will take this option. In spite of “CNALH” consider these two as different species, clicking the photo of B. maritima opens the page of B. subalbula.
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