The moorland pools in the region of the SE of Oisterwijk have an established reputation among Dutch hydrobiologists. This fame is to a large extent attributable to the extensive surveys of the desmid flora by Professor J. Heimans in the period between 1916 and 1925. His studies revealed an exceptional opulence of this algal group viz., a total of 250 species among which quite a number not recorded from any other locality in the Netherlands and also to be included among the rarities in a larger geographical region.
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