Fenológia druhov Riccia cavernosa (Marchantiophyta) a Aphanorhegma patens (Bryophyta) na obnažených dnách Dunaja v oblasti Bratislavy

Notes on phenology of two representative bryophytes on emergent waterbeds of the Danube River – Riccia cavernosa and Aphanorhegma patens in the Bratislava locality are presented. Recent data on ecology, phenology and distribution of these species are still sparse in Slovakia. Moreover, they are decreasing and vulnerable species due to degradation and destruction of habitats.