The standard moss that grows here (no idea what it is) started growing on some of my mounts, as well as on some of the clay pots in the green house containing masdevallia. The mounts it is growing on have large plants that seem fine with it. Some of the Masdevallia are quite small and if it starts creeping over the medium rather than just the outside of the pot I try and remove it, I actually remove it off the Masdevallia completely once a year when I repot, but otherwise it is not a problem and looks pretty. The couple of mount's it's on I've never removed it from.
But it's a more compact looking moss than feather moss. So that might help the plants, and I do keep an eye out for it starting to smother things.
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