LANGE-BERTALOT, Horst, & Ditmar METZELTIN 1996 Indicators of oligotrophy. 800 taxa representative of three ecologically distinct lake types: carbonate buffered - oligodystrophic - weakly buffered soft water. Oligotrophie-Indikatoren. 800 Taxa repräsentativ für drei diverse Seen-Typen: Kalkreich - Oligodystroph - Schwach gepuffertes Weichwasser Iconographia Diatomologica 2: 3-390, incl. 125 pls., 2 tables Lange-Bertalot, H. (ed.); incl. Chamaepinnularia, Geissleria n.g.; n.spp. in Achnanthes, Cocconeis, Craticula, Eunotia, Fragilaria, Frustulia, Gomphonema, Hantzschia, Luticola, Navicula, Naviculadicta, Nitzschia, Pinnularia, Stauroneis, Surirella [GE]