Green algae take many forms, some of which superficially resemble grass and other plants. Cladophora grows in tufts 3"-12" in size. Sea Lettuce - Ulva lactuca - is a green algae that grows in large sheets up to 36" like tissue paper. Small specimens are attached, but large ones are usually found drifting. It is edible and extremely common in protected waters. Enteromorpha algae superficially resembles eelgrass, and like eelgrass may also grow in thick beds.