Juergen Freund / Sargassum seaweed (Sargassum sp) floating on the sea surface, Palawan, Philippines, May

Nick Upton / Velvet swimming crab (Necora puber) in a rock pool, hiding among Coralweed (Corallina officinalis), Cornwall, UK, March.

Nick Upton / Strawberry anemone (Actinia fragracea) in a rock pool alongside Coralweed (Corallina officinalis), Cornwall, UK, March.

Nick Upton / Common shore crab (Carcinus maenas) hiding among Coralweed (Corallina officinalis) in a rock pool, Cornwall, UK, March.

Nick Upton / Coralweed (Corallina officinalis) from Atlantic Ocean. Cornwall, England, UK. September.

Philippe Clement / Common Coral Weed / Coralweed (Corallina officinalis) washed ashore on beach, Normandy, France. September

Sue Daly / Coral Weed (Corallina officinalis) English Channel, off the coast of Sark, Channel Islands, July

Nick Upton / Feathery red alga (Plocamium sp.) growing alongside Coral weed (Corallina officinalis) in a rockpool, Crail, Fife, UK, July.

Nick Upton / Coral weed (Corallina officinalis) growing in a rockpool, North Berwick, East Lothian, UK, July

Nick Upton / Coral weed (Corallina officinalis) growing in a rockpool, Crail, Fife, UK, July

Nick Upton / Coral weed (Corallina officinalis) growing in a rockpool, North Berwick, East Lothian, UK, July

Sue Daly / Purse Sponge (Scypha ciliata) on Coral Weed (Corallina officinalis). Channel Islands, UK, June.

Juergen Freund / Ambon scorpionfish (Pteroidichthys amboinensis) and similar-looking weed. This scorpionfish can change its colour for the best camouflage. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Sargassum seaweed (Sargassum sp) floating at the surface, split level, El Nido, Palawan, Philippines, May.

Alex Hyde / Coral weed (Corallina officinalis) from rockpool, Isle of Skye, Scotland, UK

Juergen Freund / Sample of Brown algae {Sarcassum cf myriosystum} from Coral Reef census, Lizard Island, Queensland, Australia, April 2008. To store the algae, specimens are pressed and dried out in a herbarium press,...

Juergen Freund / Sample of Brown algae {Sarcassum cf myriosystum} from Coral Reef census, Lizard Island, Queensland, Australia, April 2008. To store the algae, specimens are pressed and dried out in a herbarium press,...

Robert Thompson / Coral weed seaweed {Corallina officinalis} on shoreline, County Down, Northern Ireland, December

Sue Daly / Coral weed {Corallina officinalis} Jersey, Channel Isles, UK St Ouens

Jack Dykinga / Notch-leaved phacelia (Phacelia crenulata) flowering beside Ocotillo (Fouquieria splendens) with Saguaro cacti (Carnegiea gigantea) behind, Sonoran Desert National Monument, Arizona, USA, March 2023....

Jack Dykinga / Ocotillo (Fouquieria splendens) in leaf, surrounded by Notch-leaved phacelia (Phacelia crenulata) at sunset, Sonoran Desert National Monument, Arizona, USA, March 2023. Superbloom occurs after abundan...