Hustedt in Huber-Pestalozzi 1942 Category: Centric
BASIONYM: Stephanodiscus alpinus Hustedt in Huber-Pestalozzi 1942
Contributor: Loren Bahls - December 2013
Diameter: 13.8-30.8 µm
Rows of areolae in 10 µm: 12-14 fascicles
Valves cylindrical with strong concentric undulation. Central area either convex or concave with disorganized areolae. Fascicles number 12-14 in 10 µm. Striae uniseriate near the central area, becoming biseriate near the valve margin. Areolae are relatively coarse. Each interfascicle, or costa, has a spine positioned at the valve margin.
Scanning electron micrograph images and descriptions have been published by Håkansson (2002), Håkansson and Kling (1989), and Krammer and Lange-Bertalot (1991).
Basionym: Stephanodiscus alpinus
Author: Hustedt in Huber-Pestalozzi 1942
Rows of areolae in 10 µm:
Håkansson, H. and Kling, H. (1989). A light and electron microscope study of previously described and new Stephanodiscus species (Bacillariophyceae) from central and western Canadian lakes, with ecological notes on the species. Diatom Research 4 (2): 269-288.
Huber-Pestalozzi, G. (1942). Das Phytoplankton des Susswasers. Systematik und Biologie. In Die Binnengewasser, A. Thienemann (ed.) 16: 367-549. E Schweizerbart'sche Verlag. Stuttgart, Germany.
Krammer, K. and Lange-Bertalot, H. (1991). Bacillariophyceae. 3. Teil: Centrales, Fragilariaceae, Eunotiaceae. In Ettl, H., Gerloff, J., Heynig, H. & Mollenhauer, D. (Eds.). Süsswasserflora von Mitteleuropa. 2(3): 1-576. Gustav Fisher Verlag, Stuttgart, Germany.
Simonsen, R. (1987). Atlas and Catalogue of the Diatom Types of Friedrich Hustedt. J. Cramer, Berlin & Stuttgart 1: 525 pp.
Stoermer, E.F. and Ladewski, T.B. (1976). Apparent optimal temperatures for the occurrence of some common phytoplankton species in southern Lake Michigan. Great Lakes Research Division, Publication 18. 49 pp.
Theriot, E. and Stoermer, E F. (1982). Observations of North American populations of Stephanodiscus (Bacillariophyceae) species attributed to Friedrich Hustedt. Transactions of the American Microscopical Society, 101: 368-374.
Theriot, E., Håkansson, H. and Stoermer, E.F. (1988). Morphometric analysis of Stephanodiscus alpinus (Bacillariophyceae) and its morphology as an indicator of lake trophic status. Phycologia 27 (4): 485-493.
Stephanodiscus alpinus was described from Grundlsee in Austria (Hustedt in Huber-Pestalozzi 1942). Krammer and Lange-Bertalot (1991) report it as common in the eastern Alps and that it requires oligotrophic waters with low temperatures. Håkansson and Kling (1989) report S. alpinus from Canadian lakes and Stoermer and Ladewski (1976) report it from the Laurentian Great Lakes, where it prefers water temperatures less than 2 degrees C. The specimens shown here are from two alpine lakes and a stream in the Waterton-Glacier International Peace Park, Alberta and Montana. Here pH measured 7.2 to 8.5 and specific conductance measured 92 to 122 µS/cm.
Cameron Lake at the International Border, Waterton-Glacier International Peace Park, Alberta & Montana: home of Stephanodiscus alpinus.
Credit/Source: Loren Bahls