Planothidium granum (M.H.Hohn & Hellerman) Lange-Bert. Planothidium granum (M.H.Hohn & Hellerman) Lange-Bert. in Iconogr. Diatomol. 6: 276. 19991is new combination for Achnanthes grana M.H.Hohn & Hellerman1. (Basionym:) fig. 2: 9-10