A small and poorly known member of the genus, associated with mucilaginous colonies of minute coccoid green algae. It is still unclear whether this is a truly lichenized fungus or an algicolous fungus. Although it apparently represents a widespread species with a circumpolar distribution, published records are surprisingly scarce. The species is best documented from the British Isles, where it has been reported as a pioneer on wood, bark, and more rarely on compacted sandy soil (Coppins & Aptroot 2009). In the Czech Republic, A. ligniaria is so far known only from sandstone stones in Obora Hvězda in Prague. It may be an ephemeral species with a fluctuating occurrence, and during drier parts of the year it may not be found at all.
Literature: Coppins B. J. & Aptroot A. (2009): Arthonia Ach. (1806). – In: Smith C. W., Aptroot A., Coppins B. J., Fletcher A., Gilbert O. L., James P. W. & Wolseley P. A. [eds]: The Lichens of Great Britain and Ireland, British Lichen Society, London, p. 153–171. Palice Z. & Malíček J. (2025): Lišejníky přírodní památky Obora Hvězda v Praze. – Bohemia centralis 39: 99–135.
taxonomic classification:Ascomycota → Arthoniomycetes → Arthoniales → Arthoniaceae → Arthonia
All records: 2, confirmed 2. One click on a selected square displays particular record(s), including their source(s).