150 MORPHOLOGY AND LIFE HISTORY 



(g) Draw a section of the stem (X 20), to illustrate 



2, (oM). 

 E. Asexual Reproduction: 



1. Vegetative Propagation. 



(a) Describe any means of vegetative propagation 

 disclosed by your observations, already made. 



(b) If opportunity offers, the vegetative propaga- 

 tion of Selaginella may be experimentally 

 demonstrated in the greenhouse or Wardian 

 case. 



2. Reproduction by Spores. 



(a) Observe the "cones." How are they dis- 

 tinguished? Are they terminal on the main 

 branches, or axillary? 



(b) Draw (X 5). 



(c) Place a small portion of a branch, bearing several 

 mature cones, under a glass bell- jar, and after 

 twenty-four to forty-eight hours observe the 

 distance to which the spores have been projected. 

 Note the two kinds, their relative number, and 

 differences in color, etc. 



((/) Carefully remove sporophylls (i) from near the 

 base of the cone; (2) from the middle or above, 

 and mount in water or clearing fluid, keeping 

 distinct, on separate slides, those from the two 

 regions. 



(e) Note both megasporophylls, bearing mega- 

 sporangia, and microsporophylls bearing micro- 

 sporangia. How are they distinguished? 



(/) Are the sporangia inserted on the leaf, or on 

 the stem in the axil of the leaf? Compare with 

 the other plants studied in this respect* 



(g) Describe the structure of the walls of the 

 sporangia. 



