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Family Marsileaceae

Description: Semiaquatic ferns; rhizome creeping, often branched, covered with hairs.

Sterile fronds either with 4 or 2 leaflets at the apex of a stipe or filiform, vernation circinate.

Sori borne within a thick-walled, nut-like sporocarp, presumed to have arisen from the inrolled lamina; sporangia bearing spores of two kinds.


Distribution and occurrence: World: 3 genera, c. 66 species, widespread. Australia: 2 genera, 9 species, all States.

External links:
Wikipedia

Text by Peter G. Wilson
Taxon concept:

 Key to the genera 
1Sterile fronds with 4 cuneate to fan-shaped leafletsMarsilea
Sterile fronds filiform, lacking leafletsPilularia

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