Usnea glabrescens (Nyl. ex Vain.) Vain. ex Räsänen

Usnea glabrescens is one of the rarest fruticose Usnea species in the Czech Republic. Its branches are rigid, the branching is isotomic-dichotomous, soralia are round and flat to slightly concave. The thallus base is black. It has various chemotypes, usually containing metabolites from the stictic acid complex.

In Europe, it is widely distributed. It grows on tree bark, rarely also wood and rocks in various habitats. It is sometimes considered to be associated with old well-preserved forests more than other fruticose Usnea species, but in the Czech Republic it also grows in the common managed forests. Currently, it is scattered from the lowlands to the mountains, usually in young larch forests. The morphotypes with deep empty soralia reaching the central axis are sometimes distinguished as U. fulvoreagens (see the commentary on that species).

taxonomic classification:

Ascomycota Lecanoromycetes Lecanorales Parmeliaceae Usnea

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

Occurrence in the Czech Republic

All records: 17, confirmed 12. 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

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