A species characteristic by the dark undulate thallus, sometimes covered by globose to squamulose isidia. It occurs on natural limestone rocks, mainly in mountain areas. It is one of the rather rare genus members. There are historical reports on its occurrence close to Beroun, Rokytná u Budkovic and in Obří důl glacial cirque in the Krkonoše Mountains (Černohorský et al. 1956). The last-mentioned locality is the type locality of L. undulatum (Degelius 1954). Its occurrence in the valley of the Rokytná River was confirmed in the 90s by A. Vězda. Recently, it has been recorded on calcareous volcanic rock in the Vltava River valley near Smilovice.
Literature: Degelius G. (1954): The lichen genus Collema in Europe. – Symbolae Botanicae Upsalienses 13: 1–499. Černohorský Z., Nádvorník J. & Servít M. (1956): Klíč k určování lišejníků ČSR. I. díl. – Nakladatelství ČSAV, Praha. Vězda A. (1998): Flóra lišejníků v oblasti vlivu energetické soustavy Dukovany-Dalešice. – Acta scientiarum naturalium musei moraviae occidentalis Třebíč 30: 77–120.
taxonomic classification:Ascomycota → Lecanoromycetes → Peltigerales → Collemataceae → Lathagrium
most frequented synonyms:Collema undulatumRed List (Liška & Palice 2010):EN – endangered
Red List (Malíček 2023):C1 – critically endangered
Occurrence in the Czech Republic
All records: 13, confirmed 1. One click on a selected square displays particular record(s), including their source(s).