Cattleya - with unid fungus/mold on root

[Baron_anonyme]

I have recognized that the turf under some of my catts which are in the same pot. It worries me a lot, but I did not see any major issue on the leafs or in general on the roots. Can somebody tell me what is this?
I was thinking snow mold, but I am not really sure.
Also what is the best to fight this off.
the roots are kept relatively well aired and not overly humid
many thanks
Baron