Flat Moss & Cattleya

[DebsC]

I've been doing a bit of an experiment over the last several months. I've put flat moss, the kind you find growing on big rocks and sometimes the ground, on just half of the surface of cattleya pots, most grown in lava rock.

I find that the roots search out this moss and grow under it and I'm wondering why?

Is it for the shade, the difference maybe in PH or the moisture? The moss doesn't stay wet for very long but it doesn't appear to hurt it in any way.

I like the looks of it on the pot surfaces and it looks more jungle-ee (that's a scientific description )

What's your opinion?