Aquarium Plants 83 



are absorbed as nutriment by the plant. 

 Should the intruders become aware of their 

 danger and attempt to turn back, before en- 

 tering the trapdoor, they are prevented by 

 a number of stiff bristles growing inside the 

 bladder and pointing down, so that entrance 

 is an easy matter, but exit impossible. It 

 is not advisable to place this plant in any 

 vessel serving to hatch fish, as according to 

 careful observation quite a number of the 

 young fry are caught in the bladders. 



Southern Bladderwort (Utricularia ameri- 

 cana) resembles in most points the pre- 

 viously described species, but its growth 

 is considerably denser and its color 

 brighter, being a beautiful rich green, dis- 

 tinctly different from that of Utricularia 

 vulgaris. The air-bladders are slightly 

 larger, and appear after the plant has at- 

 tained a certain age. The flowers are so 

 like those of the common bladderwort that 

 no further description is required. 



Frogbite (Hydro char is morsiis-ranoc) was 



