PLATE XI 
EXPLANATION OF PLATE XL 
STAGES IN THE DEVELOPMENT OF EMBRYO 
Fig. 33. Median long, section of young embryo X 233. July 26. 
From Fig. 34. 
Fig. 34. Median long, section through end of thallus showing old 
archegonia and one young embryo X 55. July 26. 
Fig. 35. Vertical median section through young embryo X 60. 
July 26. Shows great increase in number of cells in wall of 
venter. Withered neck of archegonium still persists. Old 
archegonium left, pushed up on sides of wall of venter. 
Fig. 36. Median longitudinal section through young embryo X 55. 
Aug. 6. Archesporial cells differentiated from those forming 
capsule wall and seta, venter shows no further growth. 
