54 



DUDLEY MEMORIAL VOLUME 



In the ventral region peripheral walls occur in the outer cells, so that 

 at maturity the venter is more or less completely two layered ( Fig. 9, D and 

 E). 



Figure 9, G, shows an abnormal archegonium from a receptacle in which 

 one of the archegonia had been fertilized. In this archegonium there were 

 four axial cells, all of which were a good deal alike and all except one much 

 enlarged, so that they resembled the egg of the normal archegonium more 

 than they did the neck canal cells. 



/ 



Fig. 9. A, B, two sections of a young archegonium with five neck canal cells; 

 the ventral canal cell is not yet formed, x about 225. C, a somewhat older stage, 

 showing the egg, o, and the ventral canal cell, v. D, lower part of a nearly ripe 

 archegonium. E, full grown archegonium which has failed to be fertilized, x about 

 90. F, cross-section of the neck of archegonium. G, an abnormal archegonium 

 with unusually large axial cells. 



After fertilization there arises about the group of archegonia a tubular 

 envelope, the perianth, which finally forms a very conspicuous vase-shaped 

 sheath around the sporogonium, inside the involucre, which, like that of the 

 antheridial receptacle, is made up of very much laciniated scales. (Fig. 

 1, C. D, per.) 



THE SPOROPHYTE. 



Only a few very young embryos were found and these were not well 

 fixed, so that it was impossible to make a satisfactory study of the develop- 

 ment of the embryo. The youngest sporogonia of which successful prepara- 



