K. J. (V)LLINS 



143 



sen KM K II 



Sporopkyte. 



>J5<JCvI 



^ A ® ® B ®<^''-'" t 



^CdmeU^A^e. 



S€x-s*^r*^aftJj 



SborcpAyi^. 



^n ^ameiophyie 



MonoLcous ti/pe. 



either the cT <>t' % fjvctor, then two types of sporogonia would be pro- 

 duced, ((/) those bearing exclusively male elements whose spores {(J) 

 would result in J" gametophytes only and (6) those carrying both male 

 and female facUjrs whose spores (^) would give rise to monoicous (^) 

 gametophytes. Such a possibility is not excluded \ although it is 

 generally assumed, without definite knowledge to the contrary, that the 



* In liryum mamillatum the monoicous condition is accompanied by distinct male 

 plants. It is not possible to say whether such plants have been derived from spores pro- 

 duced by sporogonia exclusively male in character, or whether of the spores in any one 

 capsale some bear j and others A factors. 



