A few people might find this interesting so I'll post up some photos. I "harvested" a bit today for shipping, had to pull out about 1/2" of the mud with it but some quick rinsing and the UG was mostly mud free and the mud was returned to the setup.
Harvested bit.
Utricularia graminifolia by randallsimpson, on Flickr
Close-up.
Utricularia graminifolia by randallsimpson, on Flickr
Under the mat.
Utricularia graminifolia by randallsimpson, on Flickr
Close-up
Utricularia graminifolia by randallsimpson, on Flickr
Harvested bit.
Utricularia graminifolia by randallsimpson, on Flickr
Close-up.
Utricularia graminifolia by randallsimpson, on Flickr
Under the mat.
Utricularia graminifolia by randallsimpson, on Flickr
Close-up
Utricularia graminifolia by randallsimpson, on Flickr