a close up of freshwater cyanobacteria nostoc pruniforme (mare's eggs) and plants of elodea canadensis

039 american aquatic background bacteria baikal ball beauty canadensis canadian close closeup colonies cyanobacterium eggs elodea environment freshwater gelatinous green hydrocharitaceae lake lakeside leaves macrophyte mare mares natural nature nostoc outdoor plant plum pondweed pruniforme round sand shore siberia smooth sphere spheres spherical stem submerged summer surface translucent water waterweed white wild