372 



Wuist: Branched prothallia 



Adiantum cimeatum Langsd. & Fisch. — Fig. 6, I-L. Branch- 

 ing in this species occurred at an early stage in the development 

 of the prothallia. The branches originated in the first cell of the 

 filament and the growth in all cases was very rapid. In Fig. 6, L, 

 is shown a pro thallium with a branch as long as the main filament. 

 Adiantum trapeziforme L. — Fig. 7, A-G, represents branched 

 prothallia of this species. Here branching was both dichotomous 

 and monopodial. In Fig. 7, E, is shown an unusual case of dichot- 

 omous branching where both branches tended to grow in the 

 same direction. 



Fig. 7. 



Branched prothallia of A. trapeziforme L., 



X 125. 



Camptosoriis rhizophyllus (L.) Link. — Fig. 8, A-D, shows 

 branched prothallia of this species which developed on the distilled 

 water cultures, while Fig. 8, E, shows a prothallium which developed 

 on the inner surface of the pot wall of the soil cultures. Fig. 8, 

 A-D, shows the beginnings of branching in very young prothallia. 

 Branching in two of the cases was dichotomous and in the other 

 two cases monopodial. A few days after the spores were sown on 

 the distilled water, germination took place in the normal manner. 

 In Fig. 8, A, the first prothallial cell instead of dividing by a trans- 



