Fig. 68. (a)-(c) Aulocoseira ambigua: (a) initial cell; (b) initial cell beginning to expand; (c) new large-celled filament alongside original-sized ones. (d)-(f) Rhoicosphenia: (d) initial epivalve with transverse perizonial bands of the auxospore; (e) initial epivalve (f) large cell bearing the initial hypovalve (the raphidvalve) and to the left a small original cell.
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