Quite a conspicuous lichen, characterized by entirely pruinose thallus and apothecia. The thallus consists of squamules up to 5 mm large, often elongated at the margins, thus forming a rosette. Toninia candida grows on natural sun-exposed calcareous rock from the lowlands to high mountains. Initial stages are often formed on thalli of cyanolichens. It is abundant in the Northern Hemisphere but absent from areas with oceanic climate (Timdal 1992). In the Czech Republic, it occurs at lower elevations, mainly in karst areas, but is not usually abundant.
Literature: Timdal E. (1992): A monograph of the genus Toninia (Lecideaceae, Ascomycetes). – Opera Botanica 110: 1–137.
taxonomic classification:Ascomycota → Lecanoromycetes → Lecanorales → Ramalinaceae → Toninia
Red List (Liška & Palice 2010):NT – near threatened
Red List (Malíček 2023):C3 – endangered
Occurrence in the Czech Republic
All records: 87, confirmed 36. One click on a selected square displays particular record(s), including their source(s).