102 MOSS. 



The spores germinate by producing a protonema, 

 which may grow to considerable length, with numerous 

 branches, before a leafy stem is formed. The successive 

 inclinations of the transverse walls of the protonema 

 have been shown to follow the same laws as govern the 

 successive divisions of the apical cell to form the leafy 

 stems, so that we are to consider the protonema as an 

 excessively attenuated stem, from which the leafy stems 

 arise as lateral branches. 



