"Navicula difficillima Hust., 1950" . _:b76135353 "5269680" . _:b76135353 . . _:b76135353 . . "Navicula difficillima" . . _:b75418139 . "Navicula difficillima" . "5269680" . _:b75418139 . "658030" . _:b75418139 "L5d3946cc5f26ac1d" . . "L5d3946cc5f26ac1d" . _:b75418139 "AlgaeBase id" . . _:b75418139 . _:b76135353 . _:b76135353 "GBIF id" . . . "Hust., 1950" . .