Nupela butterfassiana (Lange-Bert.) Lange-Bert. Nupela butterfassiana (Lange-Bert.) Lange-Bert. in Iconogr. Diatomol. 6: 274. 19991is new combination for Achnanthes butterfassiana Lange-Bert. in Achnanthes. Biblioth. Diatomol., 18: 34, 35, pl. 71, fig. 15-29; pl. 72, fig. 2-5. 19891. (Basionym:) fig. 71: 15-29; 72: 2-5