FIGURES 53–59 in The diatom genus Ctenophora: A discussion on its morphology, relationships, and some species

FIGURES 53–59: Ctenophora vertebra. Fig. 53, reproduction of drawing for Synedra vertebra Gregory (1855: pl. 4, fig. 22); Figs 54–57, LM micrographs of C. vertebra, BM 24988, 'lacustrine sands, Glenshira, near Inverary, Scotland'. Scale bar = 10μm; Fig. 58, reproduction of Synedra acicularis W.Sm. (1853: 70, pl. 11, fig. 86; Fig. 59, reproduction of Synedra socialis Rabenh. (1853: 56, pl. 4, fig. 22).