David Hall / The blue-purple iridescence of this algal seaweed (Fauchea laciniata) is the result of light reflecting off of gland cells embedded in its surface layer. Barkley Sound, Vancouver Island, British Colum...

Solvin Zankl / Intertidal rocks covered in seaweeds, including brown algae: Toothed wrack (Fucus serratus), and Thongweed (Himanthalia elongata), red algae: left Chylocladia verticillata, middle Pepper Dulse (Osmu...

Solvin Zankl / Red algae (Chylocaldia verticillata) from Roscoff, France, April. Preserved specimen.

Solvin Zankl / Red algae (Chylocladia verticillata) from Roscoff, France, April. Preserved specimen.