Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Tropical and subtropical Africa, from Ethiopia west to Senegal and south to northern South Africa. It is an aquatic fern growing submerged in rivers and streams, attached to rocks or wood by its rhizomes. It has dark green, pinnate leaves 15-40 cm long and 15-25 cm broad. The water in its native habitat is fast-moving over sandy or rocky bottoms, very clean not very hard and slightly acidic. The roots cling to rocks and the sandy beds. It grows submerged.

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