54 



PLANTS FOE THB 



Hornwort. 



The HoRNWORTS, of which there are Bupposed to be 



several species, though Gray seems to think otherwise, 

 come next in our list. The commonest, however, if there 

 be several, is the Ceratopkyhm demerswn, and is found in 

 slow-running streams and ponds all over our country. It 

 grows quickly and well in confinement, and, together with 

 Chara, Callitrichc, and Anacharis, flourishes just as well 

 free as when rooted ; indeed, this is the case with a 

 great many fresh-water plants. In one of my Aquaria, 1 

 have a plant of the Hornwort which, when I placed it 

 in the water some six months since, was a little broken 

 sprig about six inches long, and it has now filled up more 

 than half the tank, and promises to crowd to the wall 

 the other slower growing plants. The Hornwort may be 

 readily distinguished from having long, slender, filamentous 

 leaves, arranged in whorls around a central stem, which 

 are also forked two or three times. Wo can tell it from 



