Angelo Gandolfi / Punta Forata cave, Montecristo, Tuscany Archipelago National Park, Italy. June 2010
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Will Watson / Greater duckweed (Spirodela polyrhiza) fronds up to 1 cm, Least duckweed (Lemna minuta) fronds elliptic, Common duckweed (Lemna minor) fronds ovate, Ivy-leaved duckweed (Lemna trisulca) fronds narrow...