Acarospora tejonensis Knudsen 18838 Holotype (A–C, F, H), Knudsen 18838 Isotype (D, E, G) A habit of the thallus with prolongated marginal areoles B vertical section through apothecium and margin of areole C variability of the thallus, black areoles with immersed apothecia sometimes reduced to a prominent margin D vertical section through apothecium showing parathecium with narrow hyphae E thallus of areoles lining crevices F young asci showing tholus G paraphyses slightly widened at tips, terminal cells orange-brown H ascospores. Scale bars: 1 mm (A, C, E); 100 µm (B); 20 µm (D, G); 50 µm (F); 5 µm (H).