PLATE 10 in The diatom genus Gomphoneis Cleve (Bacillariophyceae) from Lake Baikal, Russia

PLATE 10: SEM. Figs 368–371: Gomphoneis lata. External valve views. Fig. 368: Overall valve view showing robust interstriae, thickened central area, straight raphe and isolated stigmoids. Fig. 369: Headpole with raphe extending well onto valve mantle. Fig. 370: Central area with doubly punctate striae ending as single areolae and isolated stigmoids much larger than the areolae. Fig. 371: Footpole, with apical pore field bisected by distal raphe end curving onto mantle, porelli elongate and right next to the striae, and some striae composed of 2 or 3 rows of areolae.