Aridarum nicolsonii (aroid) from a tall waterfall

I was searching for Aridarum montanum in this mountain but only found Aridarum nicolsonii. According to scientific record, both species can be found in the same mountain, probably different stream or altitude. So far, nobody re-discovered A. montanum for more than a few decades after the first discovery by a foreigner long time ago. A. montanum has very long & narrow / elongated leaf, refer to this web page:

http://es.wikipedia.org/wiki/Archivo:Aridarum_montanum_drawing.png

Aridarum nicolsonii in situ.