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Algae trapped by Utricularia. (A) Trap of U. vulgaris from Seetaler See, containing algae and pollen grains. (B) Dead cells of Closterium sp. and Spirogyra sp. within a trap. (C) Dead Tabellaria flocculosa and an undetermined filamentous alga from a trap. (D) Dead Gomphonema constrictum growing on Spirogyra sp. from a trap. Bright field; scale bars ≈ 50 µm.
