1920] 



HA UPT—FOSSOMBRONIA 



331 



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. 33. —Mature archegonium; X525. 



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



X790 



Fig. 38 

 Fig. 39 

 Fig. 40 

 Fig. 41 

 Fig. 42 

 Fig. 43 

 Fig. 44 

 Fig. 45 

 Fig. 46 



. 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; 



> 



* 



