A conspicuous lichen with a relatively glossy grey placodiod thallus, dark grey soralia, gyrophoric and 5-O-methylhiascic acids (thallus C+ red). Brown cephalodia with filamentous cyanobacteria are sometimes present on the thallus. It may be confused with a small Trapelia placodioides.
Placopsis lambii grows on sun-exposed siliceous rocks and stones, often enriched with iron. It is an oceanic species, rare in central Europe. In the Czech Republic, it is currently known from five localities in northern and western Bohemia. In the past, it used to be recorded under the names P. gelida, Lecanora gelida and Placodium gelidum (see the catalogue by Vězda & Liška 1999). Placopsis gelida is a similar species and its occurrence in the Czech Republic is possible.
taxonomic classification:Ascomycota → Lecanoromycetes → Trapeliales → Trapeliaceae → Placopsis
Red List (Liška & Palice 2010):DD – data deficient
Red List (Malíček 2023):C1 – critically endangered
Occurrence in the Czech Republic
All records: 7, confirmed 6. One click on a selected square displays particular record(s), including their source(s).