This Myriospora species forms a thallus composed of scattered to contiguous areoles, usually 1.1–2.6 mm and exceptionally almost 6 mm wide. The areoles are pale rusty red to bright orange, often paler towards the margins, uneven and usually distinctly convex. Pale brown areoles are sometimes interspersed among the orange ones. Each areole usually contains 2–10, rarely many more, small, punctiform and permanently immersed apothecia. Their discs are brown to blackening and only 0.1–0.25 mm wide. The hymenium is 180–250 μm high. The thallus contains no lichen secondary metabolites.
The species grows on iron-rich siliceous rocks. It occurs mainly in open habitats from subalpine to alpine elevations, usually on the upper or vertical surfaces of boulders and rock faces, and more rarely under overhangs. It is known mainly from northern Europe and European mountain ranges. In the Czech Republic, it has been reliably documented only from Obří důl glacial cirque in the Krkonoše Mountains. Other Czech records in fact belong to M. hilitzeri.
The similar M. smaragdula usually has smaller, whitish to pale brown or yellowish-green and less convex areoles; it also produces norstictic acid. Myriospora hilitzeri has a pale brown thallus, broader apothecial discs (0.2–0.5 mm versus 0.1–0.2 mm) and a lower hymenium (130–170 μm versus 180–250 μm).
Literatura: Westberg M., Crewe A. T., Purvis O. W. & Wedin M. (2011): Silobia, a new genus for the Acarospora smaragdula complex (Ascomycota, Acarosporales) and a revision of the group in Sweden. – Lichenologist 43: 7–25.
taxonomic classification:Ascomycota → Lecanoromycetes → Acarosporales → Acarosporaceae → Myriospora
most frequented synonyms:Silobia tangerinaAll records: 7, confirmed 2. One click on a selected square displays particular record(s), including their source(s).