Morphology of Buellia alpina (16-53720 KUN) A thallus on soil within meadow B black lecideine apothecia covered with white pruina C the section of apothecium, exciple dispersa-type D ascospores with 1-septate, Callispora-type, with tapered ends E mature ascus containing four spores, Bacidia-type F young ascus containing four spores. Scale bars: 2 mm (A); 0.5 mm (B); 50 µm (C); 10 µm (D–F).