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ABC of Azolla
http://www.asahi-net.or.jp/~it6i-wtnb/azolla~E.html
A Japanese site about these aquatic ferns, their symbiosis with nitrogen fixing cyanobacteria and use for agricultural purposes.
Azolla caroliniana Willd.
http://www.dipbot.unict.it/orto/0211-1.html
Photographic images.
Azolla caroliniana Willd.
http://www.dipbot.unict.it/sistematica/Azolla.html
Microscopic image of section showing presence of the symbiont Anabaena azollae.
Azolla caroliniana Willd.
http://florawww.eeb.uconn.edu/acc_num/198501201.html
Accession data, University of Connecticut.
Azolla caroliniana Willd.
http://www.albion.edu/plants/azolcapg.htm
Images of mosquito fern from Alachua County, Florida with a link to family description.
Azolla filiculoides Lam.
http://www.hear.org/pier/azfil.htm
Description, links to images and other sites.
Azolla mexicana C.Presl
http://www.csdl.tamu.edu/FLORA/cgi/kartesz_ar_page?gen=Azolla&spec=mexicana
Distribution in Arkansas.
Azolla mexicana C.Presl
http://www.ecy.wa.gov/programs/wq/plants/plantid2/descriptions/azomex.html
Description of Mexican water-fern with link to image.
Azolla pinnata R.Br.
http://www.hear.org/pier/azpin.htm
Description, links to images and other sites.
Azolla spp
http://www.fao.org/ag/AGA/AGAP/FRG/AFRIS/DATA/558.htm
Their value as animal feed.
Green Manures - Azolla
http://www2.ctahr.hawaii.edu/sustainag/GreenManures/azolla.asp
The traditional use in SE Asia and now in Hawaii.
The Azolla page
http://azolla.fc.ul.pt/index_ing.html
Includes comparison of A. filiculoides Lam. (subgenus Azolla) and A. pinnata var. africana (subgenus Rhizosperma)