FIGURES 20–42 in Phylogenetic position of the diatom genus Geissleria Lange-Bertalot & Metzeltin and description of two new species from Siberian mountain lakes

FIGURES 20–42. Geissleria frolikhiensis sp. nov. Figs 20–42: Figs 20–35: Valve view. Figs 36–39: Live cells with chloroplast structure, explanation in the text. Fig. 40: External valve view, note biseriate striae near axial area (arrow). Figs 41, 42: Internal valve view, note props in areolae and elongated subpolar pores (annulus). (20–39: LM; 40–42: SEM). Scale bar for LM: 10 μm.