greenish algae sludge floating on the surface of the rural drain.

alga algae aquatic bog bubble cyanobacteria dirt dirty drain duckweed environment faecal float flora fungus greenish growth harmful hlorophyll manmade marsh morass moss muck nature nucleusbearing ooze organic organisms outdoor outside path photosynthetic plant pool quagmire rain river rural sewage side sinusitis slime sludge smut soggy splodge surface waste water