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(A–R). Gomphonema pseudoaugur Lange-Bertalot (A–L). Light microscopy, differential interference contrast, size diminution series. Slide no. 18599. (M–P). Scanning electron microscopy, external views. Scale bar (A–L) = 10 μm; (M) = 5 μm; (N) = 2 μm; (O–R) = 1 μm.
