AQUATIC PLANTS USEFUL TO THE MICROSCOP1ST. 63 



whose ends are notched. The plant is green, and may 

 be an incli or more wide when spread out. It is often 

 larger and more branched than shown in the figure. 

 It has no roots, but floats freely wherever the currents 

 or the winds send it. Shady places seem its favorite 

 haunts. 



As a microscopic object it is rather large and thick, 

 but it forms a good place to examine for certain Algae 

 (Chapter III.) which tangle themselves about it in fine 

 green threads, appear to favor it, and may often be seen 

 with the naked eye if the single frond is placed in water 

 above a wliite surface. 



