Psammothidium chlidanos (M.H.Hohn & Hellerman) Lange-Bert. Psammothidium chlidanos (M.H.Hohn & Hellerman) Lange-Bert. in Iconogr. Diatomol. 6: 279. 1999is new combination for Achnanthes chlidanos M.H.Hohn & Hellerman