A number of ponds and canals in the Brabant town of Waalwijk turned out to be rich in desmids, including the rare species Staurastrum subcruciatum and Cosmarium pseudoprotuberans. The cause appeared to be the supply of water from a neighbouring lake that was fed by alkaline-rich groundwater. It illustrates that suitable environments for desmids can also be present within built-up areas.

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Desmidiologische Mededelingen
Nederlandse Sieralgenwerkgroep

P. van Ruth. (2021). Meer sieralgen in een woonwijk door waterinlaat. Desmidiologische Mededelingen, 7, 2–3.