1992, Marie L. Hicks, Guide to the Liverworts of North Carolina, page 66Leaf cells are about 25–30 μm, with thin walls and bulging trigones.
Schuster Hepaticae V|4-5The epidermal cells of the capsule wall of Jubulopsis, with nodose "trigones" at the angles, are very reminiscent of what one finds in Frullania spp.
(anatomy) A smooth triangular area on the inner surface of the bladder, bounded by the apertures of the ureters and urethra.