Examination of types in the Fragilaria vaucheriae–intermedia species complex

Abstract

In a previous paper, we presented the results of type examination of the Fragilaria
\npectinalis–capitellata species complex, species which have a unilateral central area and fine striae.
\nHere, we present the results of type examination of the Fragilaria vaucheriae–intermedia species
\ncomplex, species which have a unilateral central area and coarse striae (＜13 striae per 10 µm).
\nSynedra vaucheriae var. doformis Grunow and S. vaucheriae var. distans Grunow are synonyms of
\nF. vauchriae (Kütz.) J.B.Petersen. F. intermedia Grunow is also a synonym of F. vauchriae. However, some of the figures for F. intermedia that were published by Van Heurck are a new taxon
\nsometimes identified as F. intermedia. This new taxon is described here as Fragilaria neointermedia.