Acarospora franconica is a rare low elevation species of central Europe. It occurs in sun or partial shade on sandstone, including Keuper sandstone, and volcanic rock as well as anthropogenic surfaces. It is known from only one collection from Central Bohemia (volcanic rocks at the locality Týřovické skály).
Each areole, 1–2 mm wide, usually has one immersed apothecium with reddish brown disc, darker than the brown of the thallus. The parathecium expands as the apothecia widen eventually elevating the apothecia above the areole in a brown or black parathecial margin. Based on phylogenetic analysis, it is most closely related to A. praeruptorum which also occurs in central Bohemia but differs in having a thalline margin around elevated apothecia and in being squamulose with a distinct stipe.
Literature: Knudsen K. & Kocourková J. (2020): Two poorly-known species of European Acarospora (Acarosporaceae). – Herzogia 33: 1–8.
taxonomic classification:Ascomycota → Lecanoromycetes → Acarosporales → Acarosporaceae → Acarospora
Red List (Malíček 2023):DD – data deficient
Occurrence in the Czech Republic
All records: 2, confirmed 2. One click on a selected square displays particular record(s), including their source(s).