Contribution to bryophyte flora of Croatia: new finding of rare aquatic moss Fissidens fontanus (Bach. Pyl.) Steud. in Lake Visovac (Krka National Park)

Sa？etak The rare bryophyte species Fissidens fontanus was found within the course of a comprehensive field study of the aquatic flora and vegetation of Lake Visovac (Krka National Park). This is the second record of this species in Croatia after the recent discovery in the Trep？a River. The species grows among rich macrophyte vegetation, forming small patches up to 2.5 m in depth. Due to its rareness and plausible threats, we assessed F. fontanus as critically endangered in Croatia