Azolla

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Plants ovate to triangular, usually 1–3 cm long, fragmentation of frond common. Stem short, producing short roots and trichomes. Leaves numerous, crowded, concealing stem, more or less triangular, c. 1.5 mm long, 2-lobed, imbricate, bright-red to rose in exposed situations to green in the shade; veins free; leaves usually containing the cyanobacterium Anabaena in proximal tissue. Sporocarps rarely seen, 2–4 in axil of submerged leaf-lobe. Megasporocarp less than 1 mm long, somewhat pear-shaped, apex pointed conical, covered by membranous indusium, containing 1 sporangium with 1 functional megaspore. Microsporocarp up to 2 mm long, almost spherical, covered by transparent indusium; sporangia 8–100, containing hardened mucilaginous masses (massulae) with numerous microspores.

6 species, cosmopolitan in tropics and temperate regions; 2 in Australia and Victoria.

Source: Entwisle, T.J. (1994). Ferns and allied plants (Psilophyta, Lycopodiophyta, Polypodiophyta). In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 2, Ferns and Allied Plants, Conifers and Monocotyledons. Inkata Press, Melbourne.
Updated by: Daniel Ohlsen, 2017-06-29
 
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life Life
kingdom Plantae
phylum Tracheophyta
order Salviniales
family Salviniaceae
Higher taxa
genus Azolla
Subordinate taxa