33i 



BOTANICAL GAZETTE 



[APRIL 



Fig. 27. — Young archegonium consisting of primary ventral cell, primary- 

 neck canal cell, and cover cell; X790. 



Figs. 28-30. — 'Formation of neck canal cells, ventral cell undivided; X660. 



Fig. 31. — Ventral canal cell and egg; X660. 



Fig. 32. — Cross-section of neck of same; X660. 



Fig. S3- — Mature archegonium; X525. 



Figs. 34-37. — Development of embryo; X525. 



Fig. 38 

 Fig. 39 

 Fig. 40, 

 Fig. 41 

 Fig. 42 

 Fig. 43 

 Fig. 44 

 Fig. 45 

 Fig. 46 

 X79°- 



PLATE XIX 



-Young sporophyte; X340. 



-Differentiation of spore mother cells and elaters; X525. 



-Spore mother cells and elaters; X525. 



-Sketch of same stage; X50. 



-Lobed spore mother cells; X525. 



-Spore tetrads; X525. 



-Nearly mature spores and elater; X525. 



-Sketch of same stage; X50. 



-Wall of mature capsule showing thickenings on inner layer; 



