AQUATIC VEGETATION 



239 



lucens (shining pondweed), entirely submerged ; yeUow 

 water-lily, mare's- tail, Pilularia, Myriophyllum. and 

 Chara. 



The water of pools which occur on peaty soil contains 

 a large amount of soluble organic matter, and the vegeta- 



Fio. 110. — leoetes lacustris (Quillwoet). 



tion is characteristic. The most frequent plants are the 

 bladderworts, Potamogeton natans, Scirpus fluitans (float- 

 ing club-rush), Myriophyllum spicatum, and water-violet. 



