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In contrast to the fauna and vascular plants the diatom flora in general, and presumably its endemic taxa were poorly investigated. From 1904 to 200 a total of 134 diatom taxa had been described from regionally restricted freshwater spot checks made on the large island. 95 of these were of fossil origin. All type material was collected during the first 50 years of the 20th century. Altogether some 310 taxa are documented by photographs and are discussed in the text.