The Ulvophyceae or ulvophytes are a class of green algae, distinguished mainly on the basis of ultrastructural morphology, life cycle and molecular phylogenetic data. The sea lettuce, Ulva, belongs here. Other well-known members include Caulerpa, Codium, Acetabularia, Cladophora, Trentepohlia and Monostroma.

The Ulvophytes are diverse in their morphology and their habitat. Most are seaweeds such as those listed above. Others, such as Rhizoclonium, Pithophora and some species of Cladophora live in fresh water and in some areas are considered weeds.

Ulvophyceae. Retrieved March, 04 2021, from https://en.wikipedia.org/wiki/Ulvophyceae.

Ulvales is an order of green algae.

Ulvales. Retrieved March, 04 2021, from https://en.wikipedia.org/wiki/Ulvales.

Ulvaceae 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.

Ulvaceae. Retrieved March, 04 2021, from https://en.wikipedia.org/wiki/Ulvaceae.