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ABC of Azolla
A Japanese site about these aquatic ferns, their symbiosis with nitrogen fixing cyanobacteria and use for agricultural purposes.
Azolla spp
Their value as animal feed.
Azolla caroliniana Willd.
Microscopic image of section showing presence of the symbiont Anabaena azollae.
Azolla mexicana C.Presl
Distribution in Arkansas.
The Azolla page
Includes comparison of A. filiculoides Lam. (subgenus Azolla) and A. pinnata var. africana (subgenus Rhizosperma)
Azolla mexicana C.Presl
Description of Mexican water-fern with link to image.
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