Sea Lettuce
(Ulva), any member of a genus of green algae usually found growing between high and low tide marks on rocky shores of seas and oceans. Fragments may be washed ashore by wave action. Ulva grows also in brackish water rich in organic matter or sewage. The thallus, which somewhat resembles a lettuce leaf, is a sheet of cells up to 30 cm (12 inches) long and two cells thick
posted by BrokenChurch @ 1:05 AM
