This stream bed at Pichin is not 100% limestone....some of the rocks are slate & clay. This is my first time to find Bucephalandra grows on limestone rocks!
At lower part of the stream, there is no sight of Bucephalandra:
When i walked further up, I saw more limestone rocks.
Bucephalandra motleyana grows on the limestone rock!!!
This one is white-yellowish colored!
Some got the rounded leaves....
Schismatoglottis (probably S. multiflora) is competing the space with Bucephalandra. In nearby stream where I can't find Bucephalandra at all, this Schismatoglottis is the only species of rheophytic aroid grow there.