Planothidium pericavum (J.R.Carter) Lange-Bert. Planothidium pericavum (J.R.Carter) Lange-Bert. in Iconogr. Diatomol. 6: 278. 19991is new combination for Achnanthes pericava J.R.Carter21. (Basionym:) fig. 1: 5-8, 2. Author abbreviation not checked.