Flora from limestone valley near my home

Schismatoglottis longispatha "variegated leaf".

Homalomena humilis grows on limestone wall/cliff.

Fern which only found in limestone outcrop.

Jewel orchid, Anoectochilus longicalcaratus is growing next to Schismatoglottis  longispatha on the jungle floor of limestone forest. 

Bucephalandra motleyana grows on limestone wall next to river.

It also grows on tree roots.

Or grow on slate.

On limestone boulder & the soil is clay.

Unknown species.