Aquatic multicellular macrophytes include macroalgae (the green algae in the family Characeae), non-vascular plants (e.g., mosses), or vascular plants (the flowering plants).    From Wordnik.com.  [Aquatic plants] Reference

They have been long known in the organs called the antheridia of mosses, Hepaticcae, and Characeae, and have more recently been discovered in peculiar cells on the germinal frond of ferns, and on the very young leaves of the buds of Phanerogamia.    From Wordnik.com.  [COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1] Reference