Description: The bright to pale green tubular thallus reaches 20 cm (8 in) or more tall and up to 5 mm (0.2 in) in diameter. The hollow tubes can be constricted at irregular intervals like intestines. Cells are >10 μm diameter. Habitat: This species thrives in high intertidal seepage areas or tidepools, attached or free-floating. It is frequently found in protected habitats or areas influenced by freshwater. Similar taxa: Blidingia, Pseudothrix borealis, Ulva linza, Ulva pouliotii.