red algae (chondria sp.) hangs from a rock at low tide in the black sea

black sea chondria red algae alga thickets algal flora algobiota algology algosociety obtusa chondrophycus coastline crimea europe green krimea laurencia laurencieae macrophytes nature oxygen in water synthesis palisada thuyoides photosynthesis plantae rhodomelaceae rhodophyta riparian vegetation saltwater ecology seascape seaweed selfpurification of stones surface tide undersea underwater wildlife