Acarospora badiofusca is a montane species with a conspicuous thallus of large contiguous or dispersed brown areoles up to 3 mm wide with large red-black apothecia up to 2 mm, immersed or in an elevated parathecial margin. It has a low hymenium (usually 60–80 µm) with stout paraphyses up to 3 µm wide, and dark blue hymenial gel in Lugol’s.
It occurs both in full sun, sometimes on scattered pebbles and boulders, as well as under-hangs and other sheltered microhabitats, in Asia, Europe, and North America. It usually grows on base-rich or lime-enriched siliceous rock, like mica-shists, diabase, and calciferous sandstones, but also has been collected on granite, quartzite, and iron-rich rock. Acarospora badiofusca is rare in the Czech Republic. It occurs above 1200 m and recent records are reported only from the Hrubý Jeseník Mts. Old records from lower elevations need to be revised. These determinations are usually A. irregularis.
Literature: Knudsen K., Kocourková J. & Nordin A. (2014): Conspicuous similarity hides diversity in the Acarospora badiofusca group (Acarosporaceae). – Bryologist 117: 319–328.taxonomic classification:
All records: 7, confirmed 5. One click on a selected square displays particular record(s), including their source(s).