Morphological variability of <I>Fragilaria vaucheriae</I> (Kuetzing) Boye-Petersen (Further notes)
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400 individuals collected from Lake Nakuru (Kenya) were studied. The authors had previously reported on morphological variation of this species from Lake Shikotsu (Hokkaido Island) (Fujushima·Ko-Bayashi·Kurihara and Fujita 1992) .But for the current sample, particular features were the large number of individuals with linear-lanceolate frustules (P1.6 Figs E-d.95.8%), gread variation in the outer shape of valves, and individuals for which the fmstule of the central areas extended and connected to both margins (P1.8 Figs Z-f, 18.9%) .<BR>Photomicrographs of individuals from the current samples were compared to those of type specimens of <I>Fragilaria capucina</I> (Krammer·Lange-Bertalot 1991, P1.108 Figs 1-8) and <I>Exilaria vaucherae</I> (Lange-Bertalot 1980, P1.1 Figs 26-34, Krammer·Lange-Bertalot 1991, P1.108 Figs 10-15) . With this, it may be thought, with Williams·Round (1987), that this species belongs to<I>Fragilaria vaucheriae</I>. Among the present sample, some specimens have a strong resemblance to<I>Synedra parvula</I> (P1.4 Figs A-R) or<I>Synedra amphicephala</I> (P1.4 Figs S-W) .In addition, many specimens are intermediate between<I>Fragilaria vaucheriae</I> and both of them, in their morphologies. The species of<I>Synedra parvula</I>and<I>Synedra amphicephala</I>should be considered a synonyme of<I>Fragilaria vaucheriae</I>.<BR><I>Fragilaria vaucheriae</I> (Kuetzing) Boye-Pectersen, in Bot. Not, 1938, 167 Fig 1. 1938.
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