This species is characterized by whitish, greyish, or more often brown-grey squamules up to 4.5 mm wide, bearing numerous punctiform apothecia. It produces norstictic acid, which may, however, be present in low concentrations and detectable only by TLC or in polarized light as a layer of crystals. Additional diagnostic characters include a high hymenium (120–230 μm), a parathecium up to 90 μm thick, and a discontinuous algal layer.
Myriospora myochroa grows on acidic rock, mostly near the coast, where it can also occur in the spray-zone. Its overall distribution is poorly known; the species is reliably documented from northern Europe, where it was originally described. Several records from the Czech Republic have been published under this name, but these refer to M. hilitzeri. True M. myochroa has not yet been reliably documented from the Czech Republic.
Literature: 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. /// Knudsen, K., Pušová T., Kocourková J. & Kondrysová E. (2026): Two new species of Myriospora (Lecanoromycetes, Acarosporomycetidae, Acarosporales, Acarosporaceae) from Europe, one last observed in 1925. – MycoKeys 139: 73–87.
taxonomic classification:Ascomycota → Lecanoromycetes → Acarosporales → Acarosporaceae → Myriospora
Red List (Liška & Palice 2010):NT – near threatened
Red List (Malíček 2023):DD – data deficient
Occurrence in the Czech Republic
All records: 7, confirmed 0. One click on a selected square displays particular record(s), including their source(s).