natant การใช้

• Species of the family Salviniaceae are natant ( floating ), while those of the family Marsileaceae are rooted.
• The'palate'( or hypostome ) is not connected to the dorsal shield of the cephalon ( or natant ).
• However, the natant species may temporarily grow on wet mud during times of low water, and the Marsileaceae may grow as emergent species, depending on species and location.
• Hypostome morphology is highly variable; sometimes supported by an un-mineralised membrane ( natant ), sometimes fused onto the anterior doublure with an outline very similar to the glabella above ( conterminant ) or fused to the anterior doublure with an outline significantly different from the glabella ( impendent ).