Gilbert, OL 2000: Aquatic lichens. - In: Seaward, MRD (ed.): Lichen Atlas of the British Isles. Fascicle 5. Aquatic Lichens and Cladonia (Part2). . British Lichen Society, London pp. 1(unnumbered). [RLL List # 187 / Rec.# 23323] Keywords: BRITISH ISLES/ FRESHWATER/ KEY/ MAPPING