Tremolecia atrata (Ach.) Hertel

Tremolecia atrata is an example of a ferrophilous lichen, i.e., found on acidic rocks rich in iron. Thalli of such lichens are often conspicuously orange, even rust-coloured. Tremolecia atrata resembles Rhizocarpon oederi, which forms similarly coloured thalli with a black prothallus, when found among other lichens. However, they differ in ascospores and apothecia structure: apothecia of R. oederi are more structured with a wavy margin and sometimes also central button; apothecia of T. atrata are deeply concave with whole margin.

It is a cosmopolitan species that prefers open, not very dry habitats at higher elevations. In the Czech Republic, it is mainly distributed in the mountains. The species is abundant in the top parts of the Krkonoše Mts, where it is commonly found on smaller siliceous stones on the ground that do not seem to be rich in iron.

taxonomic classification:

Ascomycota Lecanoromycetes Hymeneliales Hymeneliaceae Tremolecia

most frequented synonyms:Lecidea dicksonii auct.

Red List (Liška & Palice 2010):VU – vulnerable
Red List (Malíček 2023):C2 – strongly endangered

Occurrence in the Czech Republic

All records: 33, confirmed 15. One click on a selected square displays particular record(s), including their source(s).


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Altitude preferences

Distribution Timeline

Substrate type

Substrate preferences

© Botanický ústav AV ČR, v. v. i. 2020–2024