Found the most serviceable: - Hydrophytes (submerged aquatic plants) .Plants whose vegetive organs live wholly in water; e.g., most Algae, many mosses, ch as Fontinalis spp., and liverworts, such as Jungermannia spp.; few Pteridophytes, such as Pilularia spp., Isoetes spp.; several wering plants, such as Potamogeton pectinatus, Ceratophyllum p., Hottonia palustris, Utricularia spp., Liltorella lacustris.
Utricularia spp., which are locally abundant in peaty waters, are insectivorous.
BLADDER-WORT, the name given to a submerged water plant, Utricularia vulgaris, with finely divided leaves upon which are borne small bladders provided with trap-door entrances which open only inwards.
The products of the decay of the organisms thus A, Bladder of Utricularia neglecta (after Darwin), enlarged.
In Utricularia bladder-like sacs are formed by a modification of leaflets on the submerged leaves.
Finally the genera Pinguicula, Utricularia, Genlisea and Polypompholix belong to the gamopetalous order Lentibulariaceae.
Pinguicula is abundant in the north temperate zone, and ranges down the Andes as far as Patagonia; the 250 species of Utricularia are mostly aquatic, and some are found in all save polar regions; their unimportant congeners, Genlisea and Polypompholix, occur in tropical America and south-western Australia respectively.