Ulvaceae (/ʌlˈveɪsii/) is a widely distributed family of thin green algae having either a flat or a hollow tubular thallus, reproducing by the conjugation of planogametes or of zoospores, and being classed among the Ulotrichales or now more commonly placed in the order Ulvales.^[1]

Ulvaceae
Ulva lactuca
Scientific classification
(unranked):	Viridiplantae
Division:	Chlorophyta
Class:	Ulvophyceae
Order:	Ulvales
Family:	Ulvaceae (J.V.Lamour.) Dumort. (1822)
Genera
See text