FIGURES 281–285. SEM. 280–281. Gomphonema laticollum, internal views. 280 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes

FIGURES 281–285. SEM. 280–281. Gomphonema laticollum, internal views. 280. Footpole, raphe terminating in helictoglossa. There is a pseudoseptum present. 282–285. Gomphonema microlaticollum sp. nov., external views. 282, 284. Whole valve views. 283, 285. Central areas with biseriate striae, round stigma opening and dilated proximal raphe ends evident. Scale bars = 1 μm in Figs 280, 281, 283, 285; 2 μm in Figs 282, 284.