There is only Spathiphyllum cannifolium recorded for the Rio de Janeiro state.
http://floradobrasil.jbrj.gov....
This one is quite smaller than S.cannifolium, has a green spathe and spadix and was growing by the river in the shade.
I find the spadix confusing, it doesn't look like the one of a Spathiphyllum?, it seems to be in the stage of seed making? I even thought for a moment maybe an Anthurium species but came back from that idea too, the veination of the leaves and the petioles seem to contradict this.
