Gyalecta derivata (Nyl.) H. Olivier

A suboceanic lichen of moist old-growth forests. It prefers smooth but rotten beech bark, apparently moistened from inside. This substrate is created probably due to a metabolic activity of fungi (dying trees infected by fungi diseases). In the Czech Republic, it is a little reported taxon, known, besides the Šumava Mountains, only from the first half of the 20th century from the Beskydy Mountains (Vězda 1958). Our specimens approach, by the morphology of ascospores (size, shape, septation), the taxon Gyalecta croatica Zahlbr. (cf. Vězda 1958) and do not correspond to the description of G. derivata s. str. in the British lichen flora (cf. Gilbert et al. 2009). However, the taxon G. croatica is not accepted by most current authors. All recent findings come from the Šumava Mountains and only one of them has been published (Palice 1998).

Literature: Gilbert O.L., James P.W. & Woods R.G. (2009): Gyalecta Ach. (1808). – In: Smith C.W., Aptroot A., Coppins B.J., Fletcher A., Gilbert O.L., James P.W. & Wolseley P.A. (eds), The lichens of Great Britain and Ireland, p. 417–421, British Lichen Society, London. Palice Z. (1998): Lišejníky přirozených a polopřirozených lesních porostů na Šumavě: (1) Ždanidla. – Silva Gabreta 2: 53–58. Vězda A. (1958): Československé druhy rodu Gyalecta a Pachyphiale s klíčem a přehledem evropských druhů. – Sborník Vysoké školy zemědělské a lesnické v Brně 1958/1: 21–56.

Ascomycota → Lecanoromycetes → Ostropales → Gyalectaceae → Gyalecta