I always seem to be joining discussions when the subject has just
about been exhausted - perhaps that has something to do with time
zones etc.?
Two Utricularias which have really large bladders as well are U.
prehensilis (up to 4mm) and U. dichotoma (up to 6mm). The size
of the bladders seems to increase if the plants are grown in a
position (virtually submerged) such that the stolons and attached
bladders can grow out into the surrounding water (This is also a
good method of separating species that may be growing together in
the same container).
I hope this is of some use to someone.
Cheers for now.
Regards
Rogan Roth.
(ROTH@GATE2.CC.UNP.AC.ZA)