Acarospora moraviae H. Magn.

Acarospora moraviae was long known from a single specimen. It was described from Heraltice near Třebíč parish on gneiss at 600 m, probably in full sun, from a specimen collected by J. Suza in 1926. It was recently collected on volcanic rock in the Vltava River Valley and on diabase on Hemrovy skály in Prague.

The species has a dull brown areolate crust with angular, flat to occasional convex or lobed areoles. It has a hymenium 80–100 µm high with hemiamyloid hymenial gel, ascospores mostly 4 × 1.5–2 µm, a short cortex (10–)20–40 µm high, mostly small cortical cells 2–3 µm wide, and a translucent medulla (Acarospora usually have obscured medulla). Magnusson (1956) described the species based on his observation of ascospores probably still in asci of 2.5 × 1.5 µm. In the ascus the ascospores are that small. Roux et al. (2019) revised it as a variety of A. suzai but that species looks quite different with conspicuous blackish immersed apothecia, a usually grayer brown thallus, and dark blue (euamyloid) hymenial gel in Lugol’s.

Literature: Magnusson A.H. (1956): A second supplement to the monograph of Acarospora with keys. – Goteborgs Kungl. Vetensk.-Vitterh.-Samh. Handl., ser. B, 6: 1–34. Roux C., Poumarat S., Gueidan C., Navarro-Rosinés P., Monnat J.-Y. & Houmeau J.-M. (2019): La Acarosporaceae de Okcidenta Eŭropo. – Bulletin de la Société Linnéenne de Provence 70: 107–167.

taxonomic classification:

Ascomycota Lecanoromycetes Acarosporales Acarosporaceae Acarospora

Red List (Malíček 2023):DD – data deficient

Occurrence in the Czech Republic

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