Three Domain

 Ulva

Scientific Classification

Scientific Name - Ulva lactuca 

Domain               - Eukaryota

Kingdom             - Animalia

Phylum                - Clorophyta

Class                     - Ulvophyceae

Order                   - Ulvales

Family                  - Ulvaceae

Genus                   - Ulva 

Species                 - U.lactuca 

The sea lettuces comprise the genus Ulva, a group of edible green algae that is widely distributed along the coasts of the world's oceans. The type species within the genus Ulva is Ulva lactuca, lactuca being Latin for " lettuce ". The genus also includes the species previously classified under the genus Enteromorpha, the former members of which are known under the common name green nori.

Ulva is essentially a marine alga generally found on rock shores where it occurs attached to stones, rocks, etc. Some species of Ulva are also found in brackish water and polluted estuaries. It usually grows in association with various other algal species such as Cladophora. Ulva lactuca grows naturallly all over the world, in Europe, North and South America, Africa, the Indian ocean and Pacific islands, Southwest Asia, Australia, and New Zealand. The thallus of ulvoid species is flat and blade-like and is composed of two lagers of cells. There is no differentiation into tissues; all the cells of the plant are more or less alike except for the basal cells, which are elongated to form attachment rhizoids. 

Some Ulva species, including Ulva  lactuca, release a toxic substance into water, and that are harmful to humans. Ulva contains commercially valuable components, such as bioactive compounds, food or biofuel. The biomass due to this alga collected on beaches every year is beginning to be valorized to produce valuable compounds. These fast-growing species can act as a bioremedication agent by removing excess nutrients in the water column, such as from coastal runoff. Blooms are therefore good markers of nitrate pollution. 

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