Acarospora rehmii has a thin white ecorticate thallus immersed in the substrate from which brown small pseudolecanorine apothecia arise. It grows on Ca-enriched siliceous rock or base sandstone in full sun at elevations below 500 m. It is a rare species described from Germany where it grew on Keuper sandstone and was reported on sandstone in Italy (Magnusson 1929). It is only known in the Czech Republic from the locality Kaňk near Kutná Hora in Central Bohemia.
Literature: Magnusson A.H. (1929): A monograph of the genus Acarospora. – Kungliga Svenska Vetenskaps-Akademiens Handlingar 7: 1–400. Malíček J. (2017): Lišejníky NPP Kaňk u Kutné Hory. – Bryonora 59: 30–36.taxonomic classification:
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