4-0 Fresh Water Aquarium 



thrives well and without special care. Its 

 light green leaves are narrow on the lower 

 part of the stem, but reversed ovate on the 

 upper end, where they form little star-shaped 

 rosettes which rest on the surface of the 

 water. The plant will last for years, and is 

 one of the aquatics on which plant-eating 

 fishes prefer to feed. The Callitriche are 

 found in ditches and ponds in stagnant and 

 slowly flowing waters. 



Fall Starwort (Callitriche autumnalis) has 

 a denser and slightly darker foliage than 

 Callitriche verna, which it otherwise resem- 

 bles. The Callitriche should be planted in 

 single stems. 



Hornwort (Ceratophyllwn detnersum) can 

 be well recommended for the aquarium. It 

 will continue growing, if simply thrown in 

 the water, as it has very small roots and 

 will not take a firm hold of the gravel. A 

 band of tinfoil wound round the lower end 

 of the stem will hold it down to the bottom. 

 As the young growth of the Hornwort is 



