Planothidium apiculatum (R.M.Patrick) Lange-Bert. Planothidium apiculatum (R.M.Patrick) Lange-Bert. in Iconogr. Diatomol. 6: 274. 19991is new combination for Achnanthes lanceolata var. apiculata R.M.Patrick1. (Basionym:) fig. 1: 4-5