Cattleya - Yes
Colmanara - Yes
Cymbidium - No, unless you're sure it's an epiphyte
Oncidium - Yes
Encyclia - Yes
Dendrochilum - No experience but only a couple of Andy's Orchids Dendrochilums are mounted so I'd hold off and wait for further feedback.
Paphiopedilum - No
Phalaenopsis - Maybe, depends how moist you can keep it
Dendrobium - Yes (it's easier to mount top heavy Dendrobiums upside down).
There are two main things to keep in mind when mounting your orchids...
1. attaching them as securely as possible. If the orchid is not tightly attached to the mount then it will wobble and any new roots will be damaged and growth will be stunted. The most common method is 12lb fishing line that's wrapped around the orchid and mount several times and then tied off by twining the ends 4 times before tying several square knots.
The method I use is to tie a slip knot on one end of regular synthetic string and loop the other end through the hole of the slip knot. This creates a loop that I place over the orchid and it's mount. When I pull the string tight, the slip knot hole closes on the string and maintains tension on its own. The drawback is the string is unsightly but after the roots have attached themselves I carefully remove the string.
2. keeping them moist enough. Mounted orchids require more watering than potted orchids. I try to pick mounts that are highly textured. The more surface area the mount has the more moisture it will hold. Most people recommend using hard wood because it lasts longer but I just use any available branch with rough bark. I've got a few orchids mounted on soft wood mounts that are pretty much decomposed but are being held together by the orchids' roots.
Usually I place a compacted clump (the size of a morning star griller patty) of green sphagnum moss between the orchid and the mount. The amount of moss you use is inversely related to the amount of water you can give your mounted orchids. The more water you can give your mounted orchids the less moss you'll need to use. If you use New Zealand sphagnum then you'll need a smaller amount because it retains more moisture than green sphagnum moss.
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