A small sorediate Usnea species characterized by lateral branches constricted at the branching point, glossy cortex, absence of papillae, thin central axis and the presence of protocetraric and fumarprotocetraric acids in the medulla. It is widely distributed in Europe and throughout the Northern Hemisphere. It grows on a tree bark, more rarely also on wood, in colder and more humid areas, mainly in the mountains. Because of its small size, the species is often overlooked. In the Czech Republic, U. glabrata had a scattered distribution in the half of the 20th century. It was considered extinct at the beginning of the 21st century. However, after the strong effect of acid rain diminished, it reappeared in the Doupovské hory (Ondráček & Wagner 2012) and Brdy highlands (Malíček 2013) and in the Třebíč region (Šoun et al. 2015). Currently, it is known from many localities, mainly in western Bohemia, commonly as a part of macrolichen communities on blackthorns, hawthorns and larches.
Literature: Malíček J. (2013): Zajímavé nálezy lišejníků v Brdech. – Erica 20: 67–384. Ondráček Č. & Wagner B. (2012): Usnea glabrata (Ach.) Vain. v Doupovských horách. ‒ Severočeskou Přírodou 43: 80. Šoun J., Vondrák J. & Bouda F. (2015): Vzácné a málo známé druhy lišejníků Třebíčska a okolí. ‒ Bryonora 56: 1‒23.taxonomic classification:
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