Sebastian Kennerknecht / California Mussel (Mytilus californianus) clusters, Barnacles (Balanus sp), Black Turban Snails (Tegula funebralis), Rockweed (Fucus sp), and Sea Lettuce (Ulva sp) in high tide zone, Santa Cruz, Monte...

Scott Leslie / Sea Lettuce (Ulva lactuca) and small snails, Nova Scotia, Canada

Pete Oxford / Marine Iguana (Amblyrhynchus cristatus) feeding on Sea Lettuce (Ulva sp), Santiago Island, Galapagos Islands, Ecuador

Pete Oxford / Marine Iguana (Amblyrhynchus cristatus) feeding on Sea Lettuce (Ulva sp), Santiago Island, Galapagos Islands, Ecuador

Pete Oxford / Marine Iguana (Amblyrhynchus cristatus) feeding on Sea Lettuce (Ulva sp), Santiago Island, Galapagos Islands, Ecuador

Ingo Arndt / Sea Lettuce (Ulva lactuca) algae twenty one centimeters, Helgoland, Germany

Gary Bell/ Oceanwide / Sea Lettuce (Ulva australis) and other alga, Yorke Peninsula, South Australia, Australia

Gary Bell/ Oceanwide / Sea Sweep (Scorpis aequipinnis) in Sea Lettuce (Ulva australis), Hopkins Island, South Australia, Australia

Will Watson / Eutrophic ditch with bank erosion caused by cattle, with Spirogyra and Enteromorpha algae and floating leaves of Unbranched bur-reed (Sparganium erersum), Herefordshire Lowlands, England, UK. June, 20...

Lewis Jefferies / Diverse array of algae species including Sargassum weed (Sargassum horneri), Kelp (Laminariales), Sea lettuce (Ulva lactuca) on shallow reef with juvenile Pollock (Pollachius pollachius) and Ballan wr...

Sue Daly / Gut weed (Ulva intestinalis) Sark, British Channel Islands

Alex Mustard / Juvenile Pollack (Pollachius pollachius) swimming through shallow water rich with seaweed growth: Wireweed (Sargassum muticum and Sea lettuce (Ulva lactuca), Pendennis Head, Cornwall, UK, English Chan...