green algae enteromorpha sp. (ulva) on a stone at low tide, black sea

flora algae alga algosociety algology algal green seaweed grass photosynthesis oxygen in water oxidation synthesis selfpurification of sea ecology bluegreen macrophytes algobiota thickets riparian vegetation cladophora enteromorpha ulva ceramium polisiphonia black nladophora chondria obtusa chondrophycus coastline crimea florideophyceae krimea nature palisada thuyoides plantae saltwater seascape stones surface tide undersea underwater wildlife