In general, when mounting orchids, the sphagnum is only a padding. In nature, these guys grow directly on trees, etc. and roots don't need or use sphagnum. Some folks here use it for padding over roots, which is ok, but in general, sphagnum is not of use for mounted plants.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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