If I were ever to make fake mushrooms for a palludarium it would be a clump of these, look so much like Zoanthids/Palythoas when in big groups. Which falls north of Bangkok? Erawan?
Samlan Waterfall (Saraburi province), 10 minutes away from Saraburi city where my wife has her parent's house. I have read reports its found in Khao Yai National Park as well.