Ulvaceae () is a widely distributed family of thin green algae characterized by a flat or a hollow tubular thallus, reproducing via conjugation of planogametes or zoospores, and classified within the orders Ulotrichales or, more commonly, Ulvales.
Genera in the family Ulvaceae Source: Gemina V.J.Chapman, 1952 Letterstedtia Areschoug, 1850 Ochlochaete Thwaites, 1849 Percursaria Bory de Saint-Vincent, 1823 Ruthnielsenia C.J.O'Kelly, B.Wynsor & W.K.Bellows, 2004 Ryuguphycus H.Kawai, T.Hanyuda & T.Kitayama, 2020 Ulva Linnaeus, 1753 Ulvaria Ruprecht, 1850 Umbraulva E.H.Bae & I.K.Lee, 2001
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