Collema nigrescens (Huds.) DC.

A conspicuous epiphytic lichen, characteristic by its large, often richly fruiting and/or isidiate thalli. The lobes are markedly furrowed in dry conditions. It is an important, very sensitive bioindicator, requiring permanently humid microhabitats, such as old mossy trees in a natural unpolluted environment. Unsurprisingly, this lichen has already got extinct in the Czech Republic. Even in the past, the species was very rare. Most of the data in the Catalogue of Lichens of the Czech Republic (Vězda & Liška 1999) are from the so-called Opiz-era in the first half of 19th century. The only two more “recent” reports from the ruin of the Blansek castle in the Moravský kras karst region (Suza 1921) and from Jezerní stěna in the Šumava Mountains (Hilitzer 1924) are proximately 100 years old. All the other references are secondary citations. The lichen is rare in entire central Europe.

Literature: Hilitzer A. (1924): Addenda ad lichenographiam Bohemiae. – Acta Botanica Bohemica 3: 3–15. Suza J. (1921): Čtvrtý příspěvek k lichenologii Moravy. – Sborník Klubu přírodovědeckého Brno 3: 1–50. Vězda A. & Liška J. (1999): Katalog lišejníků České Republiky. – Botanický ústav AV ČR, Průhonice.

taxonomic classification:

Ascomycota Lecanoromycetes Peltigerales Collemataceae Collema

Red List (Liška & Palice 2010):RE – extinct
Red List (Malíček 2023):A – no recent data

Occurrence in the Czech Republic

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