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This is a species primarily of acid streams and rivers. On upland streams the scaly, reddish-brown thallus with warty or knotted isidia and occasional brown discs forms neat rosettes (1-3cm wide) on rocks and midstream boulders above the submerged zone. There is nothing else like it on wet rocks or by streams so it is unlikely to be confused with other species. Siliceous upland areas; throughout Ireland.
Original text submitted by Vince J. Giavarini