Azolla pinnata

Ferny Azolla

A floating fern of still waters. Plants in full sun are red, those in the shade are green. Azolla sp. support a nitrogen fixing blue-green algae. In Vietnam the plants are used to release nitrogen in the paddy fields. Used in home aquariums for grazing by vegetarian fish.

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Azolla pinnata has fine rootlets on the main roots, A. filiculoides (Pacific Azolla) does not.