Azolla pinnata
R.Br.Roots pendent, with numerous, fine, feathery, lateral rootlets. Plants more or less triangular in outline, regularly and pinnately branched, to c. 3 cm across. Leaves oblong-triangular with rounded apex, surface with membranous papillae in basal half; margins slightly membranous. Microsporangial massulae more or less conical, with 1–6 non-barbed processes aggregated at one end.
MuM, Wim, VVP, VRiv, MSB, RobP, MuF, GipP, CVU, NIS, EGL, EGU, HSF. Scattered throughout northern Victoria and Goulburn River valley upstream to Eildon Reservoir, also southern parts of East Gippsland. Grows in slow-moving water as well as still backwaters, dams and billabongs.
Entwisle, T.J. (1994). Ferns and allied plants (Psilophyta, Lycopodiophyta, Polypodiophyta). In: Walsh, N.G.; Entwisle, T.J., Flora of Victoria Vol. 2, Ferns and Allied Plants, Conifers and Monocotyledons, pp. 13–111. Inkata Press, Melbourne.