Achnanthes grana M.H.Hohn & Hellerman Achnanthes grana M.H.Hohn & Hellermanis basionym for Planothidium granum (M.H.Hohn & Hellerman) Lange-Bert. in Iconogr. Diatomol. 6: 276. 199911. (Basionym:) fig. 2: 9-10