Fia.4ig-—GnetTim Gfiemon: vaxiousphases of the life history; A, ovulate strobilus; 

 B, strobilus upon which only one seed has matured; C, longitudinal section of a young 

 ovulate strobilus, X 24; D, later stage, showing ovules and paraphysial hairs (h), X4S; 

 E, longitudinal section of an immature ovulate flower, showing "perianth" (p), inner 

 integument (i), rudimentary outer integument (r), and nucellus (») ; P, nucellus show- 

 ing three mother cells; G, longitudinal section of a mature ovulate flower, showing 

 the "perianth" (p), outer integument (0), and inner integument (i), X33; H, embryo 

 sac with free nuclei in a parietal layer, and showing the beginning of the constriction 

 which results in the antipodal and micropylar chambers; /, cell-formation in the 

 "antipodal chamber," another sac which is being pushed aside is shown at the right 

 above, X50; /, upper portion of sac soon after fertilization, showing a pollen tube 

 with its nucleus (t), oospores (/), and unfertihzed eggs, X340; K, embryo sac, showing 

 the suspensor-like development of the oospore (g) advancing toward the "antipodal 

 endosperm," Xs°' — All from Loisy (15) excepting F, which is after SiRAspuRGER (10). 



