Gyalecta ulmi (Sw.) Zahlbr.

The most remarkable member of the genus Gyalecta in the Czech Republic, that, at the same time, belongs among the rarest and most endangered lichens of the country. It is a primarily epiphytic species. Exceptionally, on specific substrates it may pass to ground or rocks. An example is its historical record on diabases in Motol, Prague (Servít 1930). The ideal conditions for its occurrence are met on rotten, subneutral bark of old deciduous trees in old-growth forests from middle to high elevations. These trees are often overmature. Quercus spp., Acer platanoides, Ulmus spp. and Fagus sylvatica are its favourite phorophytes. In the Czech Republic, the species has recently been recorded in few forest reserves in the Šumava, Novohradské hory and Český les Mountais, and in Podyjí National Park. One report from the late 90s of the last century comes from the Třebíč region (Gruna 1998).

Literatura: Servít M. (1930): Flechten aus der Čechoslovakei. I. Die Umgebung von Praha. – Věstník Královské České společnosti nauk 1929/13: 1–50. Gruna B. (1998): Lišejníky připravované národní přírodní rezervace „Divoká Oslava“ (lichenologický inventarizační průzkum). – Ms. [Depon. in: AOPK ČR, Správa CHKO Žďárské vrchy.]

taxonomic classification:

Ascomycota Lecanoromycetes Ostropales Gyalectaceae Gyalecta


Red list:CR – critically endangered

Occurrence in the Czech Republic

All records: 16, 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. 2020–2023