Achnanthidium indicatrix (Lange-Bert. & Steindorf) Lange-Bert. Achnanthidium indicatrix (Lange-Bert. & Steindorf) Lange-Bert. in Iconogr. Diatomol. 6: 272. 19991is new combination for Achnanthes indicatrix Lange-Bert. & Steindorf1. (Basionym:) fig. 18: 10-14