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Salviniales
Multi Spore Ferns
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Water Spangles
Mosquito Ferns
Water-clovers
Pillworts

They are all aquatic and differ from all other ferns in being heterosporous, meaning that they produce two different types of spores (megaspores and microspores) that develop into two different types of gametophytes (female and male gametophytes, respectively), and in that their gametophytes are endosporic, meaning that they never grow outside the spore wall and cannot become larger than the spores that produced them. In being heterosporus with endosporic gametophytes they are more similar to seed plants than to other ferns.

Salviniales :
Azollaceae
Marsileaceae
Salviniaceae

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Salviniales
Multi Spore Ferns
Polypodiopsida
Main Fern Class
Pteridophyta
Pteridophyta
Fern Division
Euphyllophytina
Real Land Plants
Polysporangiates
Multiple Spore Sub-Kingdom
Stomatophytes
Stomatophytes
Air Pores Sub-Kingdom
Embryophytes
Embryophytes
Multicellular Land Plants
Streptobionta
Streptobionta
Multicellular Plants
Plantae
Plantae
Plants
Eukaryota
Eukaryota
Cells with a Nucleus

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