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Brachysira zellensis f. difficilis (Grunow in Van Heurck) P.B. Hamilton in Hamilton, Poulin, Charles & Angell 1992, p. 29
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| Basionym | Navicula difficilis Grunow in Van Heurck 1880 |
| Status | Valid | |
| Published in | Hamilton, P.B., Poulin, M., Charles, D.F. and Angell, M. 1992 [ref. 003248]. Americanarum Diatomarum Exsiccata: CANA, Voucher Slides from Eight Acidic Lakes in Northeastern North America. Diatom Research 7(1):25-36. |
| Type | | Click here to view INA card. Click here to check this name in the INA website. |
| Collector | | Assessment of record accuracy | likely accurate |
| List of nomenclatural synonyms | Anomoeoneis zellensis f. difficilis (Grunow in Van Heurck) Hustedt 1959
Navicula difficilis Grunow in Van Heurck 1880
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