microscopic algae star duckweed or lemna trisulca or staurogeton trisulcus or schur or ivy-leaved duckweed. freshwater plant

algae america aquatic asia blunt closeup cooltemperate creek distributed duckweed europe floating flora freshwater genus green greenery grow growth including lake leaves lemna long macro microscope microscopic nature oblonglanceolate oceania plant plants ponds regions rivers schur shape stalk star staurogeton submerged taillike taper trisulca trisulcus underwater usually water widely wildlife