Alex Hyde / Deciduous woodland, Ulva, Isle of Mull, Scotland. June 2010.

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

Doug Perrine / Male California sea otter (Enhydra lutris nereis) wrapped in green algae (Ulva), Elkhorn Slough, Moss Landing, California, USA, June.

Mark Carwardine / New Zealand robin (Petroica australis) male, ringed by researchers, South Island race, Ulva Island, Paterson Inlet, Stewart Island, South Island, New Zealand, June

Mark Carwardine / New Zealand robin (Petroica australis) male, ringed by researchers, South Island race, Ulva Island, Paterson Inlet, Stewart Island, South Island, New Zealand, June

Chris Mattison / Sea plantain (Plantago maritima) Isle of Ulva, Mull, Scotland

Chris Mattison / Gutweed (Enteromorpha intestinalis) growing in shallow rock pool, Isle of Ulva, Mull, Scotland, June.

Chris Mattison / English stonecrop (Sedum anglicum) growing in gap in limestone, Ulva, Mull, Scotland

Solvin Zankl / Green algae (Ulva nematoidea) on white background, from Swakopmund, Namibia, Africa, South Atlantic, April. Preserved specimen.

Solvin Zankl / Intertidal rocks covered in seaweeds, including, brown algae: at top Toothed wrack (Fucus serratus) and on the left Bifurcaria bifurcata. Red algae: middle and bottom right Pepper dulse (Osmundea pinn...

Solvin Zankl / Dried Sea lettuce algae (Ulva sp.), Roscoff, France, April.

Brent Stephenson / Crown fern (Blechnum discolor) with new unfurling fronds developing, Ulva Island, Stewart Island, New Zealand, November.