Biatorella tiroliensis H. Magn.

in Rabenh. Krypt.-Fl., 2 ed., 9, 5.1: 19, 1935
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Description: Thallus crustose, pale grey, very thin and usually inconspicuous. Apothecia biatorine, 0.4-0.7 mm across, reddish brown, not constricted at base, with a strongly convex disc, without an evident proper margin. Proper exciple poorly developed, of more or less parallel hyphae, I+ blue; epithecium pale orange-yellow, K-; hymenium colourless to pale yellow, I+ deep blue; paraphyses richly branched and anastomosing in upper part; hypothecium pale yellowish brown to red-brown. Asci c. 30-spored, broadly cylindrical, apparently fissitunicate, but without a tholus, with a gelatinous, K/I+ intensely blue outer layer extending about one third the length of the ascus, and a simple, K/I+ blue apical dome. Ascospores 1-celled, hyaline, globose, c. 4.5 µm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a terricolous species, probably belonging to the B. germanica-group, but with fewer ascospores per ascus, only known from the type locality in Austria (Tyrol). To be looked for in the Italian Alps.
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Poorly known taxon in need of further study



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