FIGURES 45–47 in Observations on a fragilarioid diatom found in inter-dune lakes of the Badain Jaran Desert (Inner Mongolia, China), with a discussion on the newly erected genus Williamsella Graeff, Kociolek & Rushforth

FIGURES 45–47. Scanning electron micrographs of Fragilaria crenophila var. sinensis from untreated material from Lake Shaobai Jilin, Badain Jaran Desert deposited on a GF filter (water sample collected in June 2007). Fig. 45. External view of the apex of a whole cell in girdle view. The cingulum is composed of four copulae (labeled B1–B4), each with a single row of areolae occluded with disc–like coverings. Fig. 46. Same as in Fig. 45 but with a cingulum composed of at least seven copulae (labeled B1–B7). Copulae with open ends (arrows). The areolae covering are partially dissolved. Fig. 47. Girdle view of central part of a broken cell showing disc–like coverings of the arolae and a cingulum composed of five girdle bands (B1–B5). Scale bars = 2 μm (Figs 46, 47); = 1 μm (Fig 45).