Bacidia thyrrenica (Ramalinaceae, lichenized Ascomycota), a new species from the Mediterranean region, and a comparison of European members of the Bacidia rubella group
Llop, Esteve; Ekman, Stefan; Hladun, Nestor L.
Bacidia thyrrenica is described as a new species from the Mediterranean region. It is similar to B. fraxinea and B. rosella. Bacidia thyrrenica is distinguished from B. fraxinea based on evenly distributed crystals in the exciple and upper hymenium that dissolve in KOH, and shorter and narrower ascospores with 5-7 septa. B. thyrrenica is distinguished from B. rosella on account of the shorter, wider, and more thin-walled cells of the exciple, shorter and narrower ascospores with fewer septa, and the absence of atranorin. Both species possess colourless crystals evenly dispersed in the upper part of the hymenium and the marginal zone of the exciple. B. thyrrenica occurs from sea level to low montane areas in humid places. The species is compared to all known European species of Bacidia s. str. containing Rubella-orange as main pigment in the apothecia, as well as with the type species of the genus, B. rosella.