Polyozosia wetmorei (Śliwa) S.Y. Kondr., Lőkös & Farkas
in Kondratyuk & al., Acta Bot. Hung., 62, 1-2: 104, 2020. Basionym: Lecanora wetmorei Sliwa in Nash & al. - Lichen Flora Gr. Sonoran Desert Reg., 2: 283, 2004.
Distribution: N - TAA (B 60 0191821, det. H. Sipman).
Description: Thallus crustose, endosubstratic and poorly evident. Apothecia lecanorine, sessile, 0.4-1.2(-1.5) mm across, with a pale brown to black, but densely bluish-pruinose, smooth, mostly flat disc, and an entire, smooth, white-pruinose thalline margin. Thalline exciple 80-190 μm wide, corticate, the cortex 16-20 μm thick laterally and 60-100 μm thick at base, with granules insoluble in K, but soluble in N, visible under polarized light; proper exciple very thin or indistinct; epithecium yellowish or pale brown, with the same granules as the apothecial cortex and sometimes with larger granules soluble in K, but insoluble in N; hymenium colourless, 50–65 μm high; paraphyses simple or sparingly branched, slightly expanded at tips, more or less free in K; subhymenium distinct, granular; hypothecium colourless, 40-50 μm high, of adglutinated hyphae. Asci 8-spored, narrowly clavate, very thin-walled, with a K/I+ blue, tall tholus penetrated by a faintly amyloid apical cushion, the wall K/I-, surrounded by a blue outer layer, Lecanora-type. Ascospores 1-celled, hyaline, ellipsoid to narrowly ellipsoid, 9-13 x 4.5-6 μm. Photobiont chlorococcoid. Spot tests: thallus and apothecia K-, C-, KC-, P-, UV-. Chemistry: without lichen substances or sometimes with traces of an unknown compound.
Note: a species described from western North America, recently found also in Iran and the Caucasus. The Italian sample, identified by H. Sipman, was collected by V.J. Grummann at Karer Pass (South Tyrol), on dry twigs of Picea abies.