Hi Jln Kayu, if ur intermedia is the tropical form, would u be interested in trading for some d.filiformis? Today, I noticed that my d.intermedia has formed some sort of rest bud at the centre, and this discovery accords well with its seeds refusing to germinate without any special treatment. I thus think that, contrary to previous identification, it cld be a temperate form. I'll post pics soon for verification, but it looks unmistakenly like some sort of tight bud at the centre (or maybe it's rotting).