U. Intestinalis a thallus is tubular kink crush and can shrink or swell branching bulk group or line (Yuvadee, 2549) Thallus is clear green or yellow (Reine, and Trono 2001) have spread general the water brackish coastal area. The growth rate of under high light conditions much Ulva the algae are of economic importance. Especially in the region of Asia is used extensively. Because the seaweed chicken nutrients important, including vitamins, minerals, amino acids and fatty acids, (Aguilera-Morales 2005).
Thallus is tubular kink and crush .The base of the thallus is branching as a group or line.
Adhesive substrate with small root. Thallus is 1-20 cm long.Thallus is green or yellow.