Silva Center for Phycological Documentation: Index Nominum Algarum

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Indexes (very large files) to all taxa:

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Pleurosigma quadratum W. Smith
Syn. Brit. Diat. 1: 65, pl. XX: fig. 204. 1853. (E)
Type locality: England (various localities); Wales (Menai Straits)

See Gyrosigma quadratum (W. Smith) Griffith & Henfrey 1956

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