Ulva ohnoi

Ulva ohnoi is a species of light-green coloured seaweed in the family Ulvaceae that is endemic to Japan.

Description
It is 2 cm wide while its thallus is 20 - 30 cm high and is expanded. Its tiny serrations are 30 - 55 µm and are thick in the upper and middle regions where they can be 80 - 90 µm thick on the bottom.