PARDHI, Samadhan, Anbukkarasu VIGNESHWARAN, J.P. KOCIOLEK, Anton GLUSHCHENKO, Maxim KULIKOVSKIY, & Balasubramanian KARTHICK 2020 (Oct. 28) Morphological investigation and description of two new Gomphonema Ehrenberg (Bacillariophyta) species from India and Vietnam with biogeographical comments Phytotaxa 468(2): 175-189, 58 figs., 2 tables