Acarospora rugulosa occurs in Europe at a variety of elevations in full sun on siliceous rock. It is known from natural and anthropogenic substrates, including heaps of stones with a high content of metals. In the Czech Republic it is quite a rare species.
Acarospora rugulosa cannot be morphologically distinguished from A. squamulosa, and both develop apothecia in a thalline margin with usually rugulose disc. Anatomically A. rugulosa has a higher hymenium than A. squamulosa [(110–)125–140(–175) μm vs. 100–120(–130) μm]. Specimens that overlap are rare but if uncertain check several apothecia. Magnusson (1929) considered A. rugulosa a synonym of A. squamulosa. He treated rugulosa as A. montana H. Magn.
Literature: Magnusson A.H. (1929): A monograph of the genus Acarospora. – Kungliga Svenska Vetenskaps-Akademiens Handlingar 7: 1–400.
taxonomic classification:Ascomycota → Lecanoromycetes → Acarosporales → Acarosporaceae → Acarospora
Red List (Liška & Palice 2010):VU – vulnerable
Red List (Malíček 2023):C2 – strongly endangered
Occurrence in the Czech Republic
All records: 13, confirmed 12. One click on a selected square displays particular record(s), including their source(s).