164 



THE nOTANK'AL MAGA/JNE. 



I Vol. XXXIII. No. 392. 



Total 



34;; 



■',■)■. 



The prothallia of Woodwardia grown tinder the condition else- 

 where stated, likewise showed a strong tendenc^^ of dioecism. In the 

 culture of nutrient solution of higli concentration (1.0 per cent) 

 archcgonia alone were formed, in low concentration (0.1 per cent) on 

 the other hand, antheridia alone were formed in abundance, in spite 

 that many of the prothallia were meristic and heart-shaped. It shows 

 clearly' that the influence of nutrition shifts the direction of sex differen- 

 ciation from one to the opposite, from " female " to " male." Thus : 



Table VII. Woodwardia nulicans var. orientaris. 

 Observed on Sept. 16th (llS days after sowing). 



1.0 per cent 



No. Grow, point Arch. 



Auth. 



30 



8 



.->2 



40 



Many 



3 



4 



\'ery many 

 Manv 



10 



0.1 per cent 



No. Grow, point Areli. Anlli. 



+ II 

 + II 

 + II 



— ' Very many 



J) II 



— Many 



— ^ ery many 



+ 



II 

 II 



Mauv 



The influence of a whole on the i)art of organism which is often 

 manifested in the case of regeneration is also seen in the differentiation 

 of sex in the prothalliuni. The vegetative portions of well grown, 

 heart-shaped prothallia grown on 1.0 per cent Knop's solution wliich 

 bore only archeg<Hiia were cut off" and the dctatched pieces were trans- 



