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water net
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Water net (Hydrodictyon reticulatum).
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Water net (Hydrodictyon reticulatum).
Water net (Hydrodictyon reticulatum).

water net

green algae
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Also known as: Hydrodictyon
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water net, (genus Hydrodictyon), genus of filamentous green algae (family Hydrodictyaceae) sometimes found on the surface of quiet freshwater bodies. Because of its reproductive efficiency, Hydrodictyon proliferates rapidly and can be a problem in ponds, recreational waters, and irrigation canals.

Water net forms a free-floating network of multinucleate cells arranged in hexagons or pentagons and up to 20 cm (7.9 inches) in total length. Sexual reproduction is by fusion of similar gametes (isogamy). Asexual reproduction is by motile zoospores, hundreds of them contained in each cell becoming arranged in small netlike structures. When a mature Hydrodictyon net dissociates, each cell liberates a miniature net.

This article was most recently revised and updated by Melissa Petruzzello.