Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 21: 303. 1895.
Fronds 1 or 2–8 coherent together in often starlike groups, narrowly tongue-shaped to ribbonlike, 1.2–7.5 mm, 3–8 times as long as wide, rounded at tip or pointed; tract of elongated cells running along or near edge of lower wall of pouch; area of air spaces within frond much longer than wide, often spreading throughout most of frond; angle of pouch 45°–90°; flowering fronds similar to vegetative ones. Fruits 0.3–0.4 mm. 2n = 40, 42.
Phenology: Flowering (very rare) throughout year.
Habitat: Mesotrophic, quiet waters in warm-temperate to subtropical regions with mild winters
Elevation: 0–400 m
Calif., Fla., La., Miss., Tex., Mexico, West Indies, Central America, South America.