Hello fellow Oregonian...
Platy. jesupiorum I've not grown, though I would guess it's culture is approximate to Platy. misera which I have; namely intermediate to cool temps, high relative humidity, ample water (with low dissolved solids) and great airflow...they grow best in a wardian case type set-up though I could see growing them in the greenhouse as well, provided they were either near the swamp cooler for the summer or you had either a sunken section of the house, were growing on the coast/at altitude or were cooling a section of the collection.
I'll answer the questions you laid out the best that I can:
1. Mounting: you could definitely grow on cork, but as these little guys like to stay moist, I'd opt instead for tree fern--it may not last as long (at which point you'll just mount the mount to a larger piece of tree fern and carry on), but it's more retentive of moisture and mosses grow very well on it. Compared to cork it is relatively expensive, but as you are growing micro-minis, you won't need much...
2. Moss: as was noted, spores usually abound, especially on established mounts--perhaps doubly so on things that grow in very humid conditions. If you want to jump start, there are three routes you might go; a. grab moss starts from one of the dart frog supply houses (ie Josh's Frogs, Black Jungle Terrarium Supply, etc.), b. beg some cuttings off a grower with moss on mounts; some growers love the stuff, some hate it, c. use collected (and quarantined/disinfected moss)--the easiest way to get collected moss free of pests is to tie it to a rock and drop said rock into a container of distilled water (don't use tap water) overnight...anything insect/sluggy will drown (though you may have to contend with eggs of said pests down the line, but I've not had problems...you could also probably place in a sealed bag and flood with co2 for effective pest quarantine)
I'm not sure how well these would display with bonsai--I'm not really envisioning them as workable kusamono...then again, I could see them being mounted to something with similar cultural needs and used as an accent (perhaps one of the epiphytic azaleas...)
Something to bear in mind with culturing these guys with live moss is to be pretty fastidious in trimming moss on mounts--some mosses will grow at a much faster rate than your plant.
I see Andy's was mentioned in the source notes above, I would also check out J&L Orchids, Columbian Orchid Imports and, when you get a bit of experience under the thumb, Ecuagenera.
Other things to consider: lighting, maintaining required humidity (in the house a terrarium/vivarium/wardian case is pretty much an essential, even if it's just a 10g aquarium with a tight fitting lid), some form of air circulation (CPU fans and controllers are awesome) & automated
misting (trust me, once you invest in it, you'll wonder why you didn't earlier...)
More questions? We'll all try to help.
Good growing,
Adam
PS: Where in OR is home? Portland here.
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Coffee roaster/Engineer from Oregon! Platystele species?
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