146 MORPHOLOGY AND LIFE HISTORY 



from the foliage-leaves? Are they aggregated 

 in a cone? If so, what effect does the forma- 

 tion of the cone have on the further growth of 

 the branch? 



(c) Is Lycopodium a homosporus or a heterosporus 

 plant? 



(d) Describe a single sporangium, its mode of 

 dehiscence, and the relative number (i.e., 

 few or many) of spores it bears. 



(e) Into what do the spores develop? 



(/) Make drawings as follows: (i) a cone (X 4); 

 (2) a sporophyll, with sporangium (X 10); (3) 

 under the low power a few of the spores, and 

 (from younger sporangia) a few of the spore- 

 tetrads. 



THE GAMETOPHYTE 



E. Sexual Reproduction: 



1. The gametophyte of Lycopodium is rarely seen, and 

 not readily obtained in artificial culture. Its 

 laboratory study may be omitted in a beginning 

 course, but the subject should be presented by 

 lecture, or preferably studied from a text and then 

 discussed in class, with demonstrations of preserved 

 material. 



2. Diagram the life cycle of Lycopodium. 



