Flavoplaca oasis (Massal.) Arup, Fröden & Sochting eco lithophila = Caloplaca oasis (Massal.) Szatala eco lithophila

    This very nitrophilous taxon differs from Flavoplaca (Caloplaca) oasis morph. oasis by its occuring on cement, or fiber cement, damp and dirty walls where it does not seem to parasitize other lichens (in particular: Flavocarpa (Caloplaca) arcis, Myriolecis semipallida, Verrucaria nigrescens s.l., ...). Thallus barely visible more or less endolithic, often blackish with cyanobacteria. Asci: 35-45 x 15-20 µm according to our measurements. Polarilocular spores, 10-15 (17) x 6-8 (9) µm with a septum of (3) 4-5 µm. Fairly common taxon on damp walls and in the shade of piggeries in our prospecting area.

N.B. Taxon probably confused with Athallia (Caloplaca) holocarpa s.l.

N.B. The fact that this taxon is considered as non-parasitic may need to be modified because in the present example it seems parasitic on Flavoplaca arcis and Verrucaria nigrescens s.l.