The ultrastructure of Gomphonema augur and Gomphonema gautieri (Bacillariophyta)

Bart Van de VIJVER, Amelie JARLMAN, Myriam DE HAAN & Pierre COMPERE

en Cryptogamie, Algologie 34 (2) - Pages 103-116

Published on 24 May 2013

The ultrastructure of Gomphonema gautieri (Van Heurck) Lange-Bert. et Metzeltin was studied based on a small population from a small Swedish, slightly acid, eutrophic river. The observations were compared with the holotype slide of G. augur var. gautieri Van Heurck, as the species was originally described in 1885. The valves are characterized in having a typical clavate outline with the largest width near the broadly rounded headpole. The species can be separated from G. augur Ehrenb. by its larger valve dimensions, the presence of broad shoulders on the headpole and the lower number of areolae per stria. Based on these differences, a separation of both taxa is justified.

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