Achnanthes pericava J.R.Carter Achnanthes pericava J.R.Carter1is basionym for Planothidium pericavum (J.R.Carter) Lange-Bert. in Iconogr. Diatomol. 6: 278. 199921. Author abbreviation not checked., 2. (Basionym:) fig. 1: 5-8