This is nothing more than supposition on my part, but based upon what I've seen and read, it appears that most orchids are VERY specific about the particular fungus needed for seed germination, while some others are a bit more flexible about it.
Let us not forget that all of our plants are "in cahoots" with a wide range of microorganisms, and in our captive culture, where the indigenous species are likely quite different from those the plants evolved with in the wild, who's to say which ones they are, and whether they are "the right" ones? Then there's our use of the wide array of treatments that may affect that.
All that said, Ben's comment about sowing the seed around the mother plant may be the best possible option, if not necessarily a likely one for success.
_________________ Ray Barkalow, Orchid Iconoclast Using science & logic to improve orchid growing
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