Achnanthes acidoclinata Lange-Bert. Achnanthes acidoclinata Lange-Bert. in Lange-Bertalot & Metzeltin, Indicators of oligotrophy. Iconogr. Diatomol., 2: pl. 21, fig. 22-24; pl. 113, fig. 1-7. 1996is basionym for Planothidium acidoclinatum (Lange-Bert.) Lange-Bert. in Iconogr. Diatomol. 6: 279. 199911. (Basionym:) fig. 21:22-24; 113:1-7