Pollen preservation - any ideas?

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Does anybody know how to preserve pollinia so it can be used later in a cross? I'm asking because I've got a couple plants I'm considering for a cross (Masd. rechingeriana which is in bud , and either Masd. triangularis or tovarensis. I've yet to make up my mind ), but they won't be flowering at the same time, so I'm hoping there's some way I can save the pollinia from one for a little while until the other flowers.

Thanks for any and all ideas!