Abstract
The following species are examined: Cyclotella minutula Kutzing, Stephanodiscus minutus H. L. Smith Type 504, Grunow in Cleve & Moller 221, S. oregoniae H. L. Smith Type 506, Discoplea oregonica Ehrenberg, Stephanodiscus carconensis Grunow var. carconensis, S. carconensis var. minor Grunow, and S. carconensis var. pusillus Grunow. The study is based on original material, drawings, and annotations from collections or exsiccata of Kutzing, Ehrenberg, H. L. Smith, Cleve & Moller, and Moller, and where possible also on light and electron microscope studies of unmounted type material. The results show both morphological differences and similarities between the observed species. The material on slides 504 (H. L. Smith) and 221 (Cleve et Moller) are identical. The material on slide 506 (H. L. Smith, Klamath Lake) is identical with that from the Grunow collection (slide 2007, Klamath Lake). The name Stephanodiscus minutus has never been validly published, and has been widely misused, but the diatom to which it wa...
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