Utricularia humboldtii and nelumbifolia both grow in bromeliads but I haven't heard of quelchii doing that. I don't think it would do well in water. I've never grown any plants on filter media myself but it could be worth a try. I have seen a plantlet growing on a Utricularia alpina leaf before, and I remember RSS growing a plant from a leaf in the Orchidioides discussion thread. I think both cases were accidental. The most reliable way to propagate these plants is with divisions.
I have over the many years of growing Utrics had success propagating many species from leaves, bladder runners, just about any piece. Every time has either been by accident or they required alot of babying to keep them alive, I would not recommend it unless you are just wanting to experiment with extra pieces you may have.
I generally try for a piece about this size.
Utricularia quelchii by
randallsimpson, on Flickr
additionally to this question: what are some good bromeliad species to try this out in?
The primary one would be Brocchinia reducta, this is the species that grows with Utric. humboldtii in nature. I just moved mine over to a windowsill to see if I can keep it healthy outside a terrarium before introducing some Utric. humboldtii into the bromeliad.
I have yet to find a filter/sponge material that Utrics will really grow into, they just attach to the material and send out runners to find a better home, live sphagnum moss or that junk moss that everyones hates seem to be the preferred medium for almost all the Utrics I've grown.
Here I'm been growing Utric. nephrophylla for a few years without issues, flowers well and the only real problem is that stupid moss. Basically it is a seed starting sponge I found that fits perfectly into that glass tube. The PVC pipe is just used to keep the light away from the bottom part to keep algae away.
Sorry about the bad photos but it has been a long weekend.
DSC_0084 by
randallsimpson, on Flickr
DSC_0088 by
randallsimpson, on Flickr
Probably my favorite way to propagate the more difficult Utrics would be taking the small black net pot on the right and filling it very loosely with a about half and half tree fern sticks and live sphagnum moss. Just make sure and pull a few pieces the sphagnum moss through the bottom of the pot about 1" to allow for wicking into the black net pot. I then put the black net pot into the clear tall net pot and place that inside the small cup. The cup is filled about 1/2 to 3/4th full of good quality water and left in piece in good conditions for the species. When it comes time for shipping you just remove the small black net pot and pack it. If everything goes to plan you will have enough runners outside the black net pot to repot a few more and repeat for 10 years....This takes up very little space and is great when shipping day comes around.
DSC_0086 by
randallsimpson, on Flickr
Utric quechii on the left.
DSC_0087 by
randallsimpson, on Flickr
Other things I've tried in the past.
Utric humboltii in about 1/2" of water with a very small about of live sphagnum moss.
DSC_0065 by
randallsimpson, on Flickr
DSC_0064 by
randallsimpson, on Flickr
Utric humboltii on a windowsill growing in a "styrofoam raft" filled with seed starting sponges and tree fern sticks.
Started out like this.
DSC_0066 by
randallsimpson, on Flickr
Last photos I took of it are below it is larger now.
Utricularia humboldtii by
randallsimpson, on Flickr
Utricularia humboldtii by
randallsimpson, on Flickr
Utricularia humboldtii by
randallsimpson, on Flickr
Some other things I've wrote that are similiar to what you are talking about.
http://www.terraforums.com/forums/u...ea-suggestions-underwater-growth-display.html
http://www.terraforums.com/forums/b...a-grow-planning-looking-input.html?highlight=
http://www.terraforums.com/forums/u...orchiodioides-setup-planing-construction.html Still hoping I will be able to finish this one someday.