Also one of the pro-moss gang here, with a caveat. I've been growing four species Phals, five Masdevallias, three Dendrochilums, and a Miltonia Morelliana in pure moss with great success for a few years. I also grow all my Bulbophyllum species and hybrids (10 plants) in sphag mixed with shredded tree fern. But -- as greenbean pointed out -- these are all moisture-loving plants. (The Dendrochilums in particular drink more than any other orchid I've seen.) I follow the others' strategy, letting the moss get almost crispy before re-watering, and keep an eye on the color of the roots with clear pots.
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