A lichen similar to the common species P. tuberculosa, with which it also shares the presence of confluentic acid, but differing in having a thicker, whitish, areolate thallus with a non-amyloid medulla (I–), and in having non-pruinose apothecia with a well-developed exciple. The species was described relatively recently from flat siliceous rocks in the Scottish Highlands (Fryday 2005) and was later reported also from Russia (Urbanavichus & Urbanavichene 2018). In the Czech Republic, it has so far been found only on the sandstones near Hradčany (an uncertain record) and in the Krkonoše Mountains: on mica schist on the Kozí hřbety ridge (a typical specimen) and on Studniční hora Mt (a fertile, non-sorediate thallus).
Literature: Fryday A. M. (2005): The genus Porpidia in northern and western Europe, with special emphasis on collections from the British Isles. – Lichenologist 37: 1–35. /// Urbanavichus G. & Urbanavichene I. (2018): New records of lichens and allied fungi from Lapponia petsamoënsis, Murmansk Region, Russia. – Folia Cryptogamica Estonica 55: 1–5. /// Malíček J. & Steinová J. (2025): Contribution to lichen biota of the Krkonoše Mountains, the highest Czech mountain range. – Herzogia 38: 308–335.
taxonomic classification:Ascomycota → Lecanoromycetes → Lecanorales → Lecideaceae → Porpidia
Red List (Malíček 2023):DD – data deficient
Occurrence in the Czech Republic
All records: 3, confirmed 2. One click on a selected square displays particular record(s), including their source(s).