XXVIl] 



GAMETOPHYTE 



247 



Lastly, it should be stated that both apospory and apogamy have been 

 observed. The latter is definitely seen in T. alaUiin, but the embryo in 

 Fig. 516, of T. rigiduni, can hardly have been produced otherwise than by 

 normal syngamy. 



Fig. 518. Trichomanes pyxidiferiim. a — ^= development of an antheridium: £? = aiche- 

 goniophore with five archegonia : /, j^:= development of archegoniophore. ( x 150.) 



AjT 



Fig. 519. HymenophyUiundilatatum Sw. 

 Lobe of a prothallus with a group oi 

 archegonia {Ag). ^;/ = antheridia : 

 iy=hairs. (After von Goebel from 

 Englerand Prantl.) 



