Planothidium joursacense (Hérib.) Lange-Bert.
Planothidium joursacense in Iconogr. Diatomol. 6: 277. 1999
is new combination for Achnanthes joursacensis, Diat. Fos. Auvergne 2: 5, t. XI, fig. 26, 27. 19031,2
Planothidium joursacense
1. Published as Achnanthes 'joursacense (data from INA)., 2. Etymology: epithet named for Joursac, the type locality.