Acarospora monacensis is a rare species with C+ red cortex on basic silicieous rock, quartzite veins in limestone, and on brick roof tiles. Its areoles are brown to fuscata brown, 0.5–1 mm wide, dispersed or contigious. It lacks the melanized lower surface usually formed by A. fuscata and is uplifted by a mycelial base. The parathecium is indistinct around immersed apothecia, to 30 μm wide forming a black ring around the disc, eventually expanding 30–60 μm wide forming an elevated margin, often black, sometimes color of the thallus. The hymenial gel is IKI+ euamyloid, in squash blue or hemicryptic (half-hidden), turning red, becoming blue again in about 15 minutes. Acarospora fuscata is usually IKI+ red or pale blue turning red in squash if IKI is good.
Acarospora monacensis was described from rooftops in Munich, Germany. It was recently rediscovered in the Czech Karst (Srbsko) and in Germany. It was forgotten as a synonym of A. fuscata.
Literature: Knudsen K., Kocourková J., Peksa O., Beck A., Velmala S. & Wirth V. (2024): Three poorly known Acarosporaceae of Central Europe: new reports from Czech Republic, Germany, and Italy. – Herzogia 37: 5–15.
taxonomic classification:Ascomycota → Lecanoromycetes → Acarosporales → Acarosporaceae → Acarospora
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