A floating fern, considered an invasive species in Portugal.
Azolla species native to Okinawa. Photos by K. Ishikawa, Thinzumi pond, Bios garden.
Azolla filiculoides, in association with hydrocotyle and various duckweed species, forming a mat over Turtle Pond, Fairfield Osborn Preserve.
aquatic fern covering a good part of a freshwater pond
small aquatic fern, free floating, mostly in clumps, occasional single individuals - seemed to favour fresh end of the salinity gradient in the wetlands
Azolla (mosquito fern, duckweed fern, fairy moss, water fern) is a genus of seven species of aquatic ferns in the family Salviniaceae. They are extremely reduced in form and specialized, looking nothing like conventional ferns but more resembling duckweed or some mosses.