Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Ceratophyllum demersum (Rigid Hornwort) is a species of Ceratophyllum, with a cosmopolitan distribution in temperate and tropical regions. It is a submerged, free-floating aquatic plant, growing in still or very slow-moving water in ponds and streams with summer water temperatures of 15-30 °C and a rich nutrient status, rooting in mud at the bottom of the water. The stems reach lengths of 1–3 m, with numerous side shoots making a single specimen appear as a large, bushy mass.

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