Scytinium rivale thalli are composed of minute lobes tightly adhered to the substrate. Apothecia are rare. It grows on more or less permanently inundated rocks in clear mountain springs or on the shores of mountain lakes, where it might also colonize bryophytes. The species is very rare in Europe, known only from a couple of localities, mainly in the Carpathians. Its only locality in the Czech Republic is the area of Úpské vodopády (waterfalls) in the Krkonoše Mts, where it was collected and identified by V. Kuťák as Leptogium cataclystum (Guttová 2000), and where it still grows (see Thüs & Schultz, including photographs).
Literature: Guttová A. (2000): Three Leptogium species new to central Europe. – Lichenologist 32: 291–293. Thüs H. & Schultz M. (2009): Fungi: Lichens Pt. 1, Freshwater Flora of Central Europe. – Spektrum Akademischer Verlag, Heidelberg.taxonomic classification: most frequented synonyms:Leptogium rivale
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