I have used this method: the pollinia are wrapped up in soft paper ('kleenex'), with id, and placed in small plastic bottles (I use FDC Vitamins empty bottles), with a silica-gel package inside (to avoid humidity). Then the bottle is placed in the fridge, as far as possible of the freezer. In that conditions the pollinia remain fertile for ~6 months (Stanhopea), or even more (~1 year) in cattleya-alliance orchids. The time of viability is variable from species to species.
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Frederico
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