FERTILIZATION 



69 



(b) Formation of Gemma. Gemmse develop from the 

 tissue at the apex of the gametophyte. Each gemma is 

 rounded or oval in outline and consists of a single layer of 

 cells attached to a stalk composed of one row of cells. Each 

 gemma will, under favorable conditions, develop into a game- 

 tophyte plant. 



FIG. 35. Musci. Eight figures showing the moss spore, the protonema- 

 bearing buds and a young moss plant. 



(c) Proliferation occurs in male plants after the formation 

 of antheridia. A bud forms at the apex and grows into a 

 male plant. Frequently proliferation occurs three times in 

 the same plant, each new plant in turn producing antheridia 

 or male reproductive organs. 



