"39431" . _:b75416317 . . _:b75416317 "39431" . . . "Pleurosigma angulatum var. strigosum" . "(W.Smith) van Heurck, 1885" . "Pleurosigma angulatum var. strigosum (W.Smith) van Heurck, 1885" . _:b75416317 . . . . "Pleurosigma angulatum var. strigosum" . _:b75416317 "AlgaeBase id" . _:b75416317 . . "1007253" .