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Abstract
This morphological investigation deals with taxa in the Cyclotella striata complex. The following species and varieties were examined: Coscinodiscus striatus, Coscinodiscus minutus, Cyclotella striata var. baltica, C. striata var. ambigua, C. striata var. mesoleia, C. (striata var.?) subsalina, C. dallasiana and also Discoplea sinensis. The study also utilized material, drawings and annotations from the collections of Ehrenberg, Kützing, Grunow, Eulenstein and Cleve & Möller; and, where possible, light and electron microscope studies were made of unmounted original material.
The results show structural differences between species. A lectotype has been selected for Coscinodiscus striatus Kützing (Cyclotella striata (Kütz.) Grunow) and for Coscinodiscus minutus Kützing, but the name Cyclotella minuta is already occupied and a new name for this species, C. exigua nom. nov., has had to be chosen. C. striata var. baltica is shown to be a species separate from C. striata and to be conspecific with C. litoralis Lange et Syvertsen; the correct name for this species is thus C. litoralis. C. dallasiana W. Smith and Discoplea sinensis Ehrenb., are synonymous with C. striata, while it is shown that C. ambigua Grunow is a species in its own right.