Bacidina brandii (Coppins & van den Boom) M. Hauck & V. Wirth

Herzogia, 23, 1: 16, 2010. Basionym: Bacidia brandii Coppins & van den Boom - Lichenologist, 34: 328, 2002
Description: Thallus crustose, episubstratic, of scattered to usually confluent, convex, 0.1-0.4 mm wide, greenish grey to pale brown-grey, ecorticate areoles. Apothecia numerous, biatorine, dispersed to crowded, sessile and adpressed, 0.05-0.5 mm across, with a flat to usually convex, at first pale red-brown, then dark red-brown disc and a paler margin. Proper exciple 24-40 μm wide, hyaline, the cell lumina 3-5 μm in the middle part, widening towards apical edge to 7(-10) μm, sometimes excipular hyphae thinner, 1.5-2 μm, but at least most outer row cells swollen and up to 7(-10) μm thick; epithecium colourless; hymenium colourless, 30-40 μm high; paraphyses few, simple, 1.5-2 μm thick at mid-level (in K), the apical cells clavate-capitate, up to 5 μm wide; hypothecium dark reddish brown, K+ dull fuscous brown. Asci 8-spored, clavate to cylindrical-clavate, the apical dome K/I+ dark blue with a pale, conical-pointed apical cushion (axial mass) never penetrating through the entire d-layer, the wall K/I-, but the thin outer gel K/I+ blue, Bacidia-type. Ascospores (0-)1-3-septate, hyaline, acicular, straight, or mostly slightly curved, 24-31 x 0.8-1.3 μm. Pycnidia rare, whitish, more or less immersed, the wall hyaline. Conidia thread-like, curved, 23-30 x 0-8-1 μm, appearing narrowly 3-septate in lactophenol-cotton blue. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: thallus probably without lichen substances; apothecia with the Arnoldiana-brown pigment in the hypothecium.
Note: a species with a wide distribution in Central Europe, from the British Isles to Russia, also known from Alaska, growing on subacid bark, rotten wood and rusted metal. To be looked for in Italy.
Growth form: Crustose
Substrata: bark and rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Pioneer species

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Predictive model

J. Motiejūnaitė - Source; Himelbrant D.E., Stepanchikova I.S., Motiejūnaitė J. 2017. New records of lichens and allied fungi from the Leningrad Region, Russia. VIII. Folia Crypt. Estonica, 54: 63-70.