The lichen flora of 29 rivers and watercourses of Galicia (Spain) is studied, along with some ecological variables. In this paper, 33 taxa of lichens with perithecioid ascoma are reported. Of them, 2 are new record to spanish flora, 5 have been recorded for the second time and 10 are new to Galicia.
Pyrenocarpous lichens, freshwater, Galicia, Spain