Plants: brown, dark brown to nearly black. Branch: leaves lanceolate to linear-lanceolate, apex narrow and tubular, hyaline cells with 8–12 moderate-sized (more than 0.25 cell diameter) in mostly one row.
Floating or stranded at margins of shallow lakes and ponds, rarely in seeps where probably constantly wet. low to moderate elevations. Nfld. and Labr. (Nfld.), N.S., Ala., Ark., Del., Fla., Ga., La., Md., Miss., N.J., N.Y., N.C., S.C., Tenn., Tex., Va. Discussion.