Just thought I would post a picture of my preferred method of propagation: the terrarium. this tank is mostly for species, but things tend to get mixed in!
i make use of styrofoam peanuts by placing a layer at bottom for drainage (also keeps the terrarium light), then a thin layer of charcoal, and then my medium (in this tank it's nice black gold potting soil with added perlite). So far this mix has worked in oregon and in arizona, where it's been less humid. i keep a light on 24/7 and have the screen top sealed with slitted saran wrap for moisture control with air flow (air flow is a must in enclosed environments!). it gets misted every other day and watered once a week or two, depending.
i just re-arranged this last week since i had quite a few things to propagate. B. rajah grows in there permanently, but you'll see some listada hybrids, B's bipinnatifida, serratipetala, luzonensis, hydrocotylifolia, prismatocarpha variegata, imperialis, nimbaensis, etc. plus the hoya growing on a chopstick.