Azolla rubra, growing on damp mud in seasonal pond
Common fern on top of water.
Marion Sansom Park
Azolla rubra (red azolla). Halswell Quarry Park, Christchurch. © Murray Dawson
On mud surrounding rush dominated wetlands in dune hollows
Azolla rubra (red azolla). Pegasus Bay Walkway, Canterbury. © Murray Dawson
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.