284 THE BIOLOGY OF THE PLAINT 



its roots ? If not, how does the plant probably get its 

 nourishment ? Is it like Spirogyra and Vaucheria in this 

 respect ? Of what use is the limy coating ? Do you find 

 that, aside from the reproductive organs, there is any 

 great variety of shape, size, structure, etc., exhibited by 

 the cells of Clui,ra% What structural resemblances do 

 you find to exist between leaf and stem ? What dif- 

 ferences in their terminations ? 



Break the branches off a vigorous plant, put them in 

 water, and watch them for several weeks. Do they con- 

 tinue to live ? If so, could Chara be propagated in this 

 way, i. e., without the formation of spores? 



Do you find any points of resemblance between Chara 

 and Vaucheria ? 



Does the general plan upon which Chara is construct- 

 ed, i. e.,& segmented body with segmented appendages, 

 remind you of any animal which you have studied ? 



What do you regard as the most striking feature of 

 the cells of Chara ? 



Compare Polysijphonia, one of the red sea- weeds, with 

 Chara. 



