calcareous algae (corallinaceae) near the shore on a stone at low tide in the black sea

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