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BOTANICAL GAZETTE 



Fig. io. — Vertical section of developing air cavities in an archegonial 

 receptacle; X750. 



Fig. ii— Vertical section of an air pore of the thallus; X667. 



Fig. 12. — Vertical longitudinal section of a thallus with two archegonial 

 receptacles and one antheridial. 



Fig. 13. — Vertical section of a pore in an antheridial receptacle. 



Fig. 14. — Vertical section of an early stage of an archegonial receptacle; 

 X67. 



Figs. 15-20. — Stages in the development of an air pore of the archegonial 



Fig. 21. — Surface view of an air pore of the thallus. 



Figs. 22-27. — Stages in the development of the archegonium before the 

 formation of the egg; fig. 25 shows also the origin of a scale and of the invo- 

 lucre (*). 



Fig. 28— Vertical section of a venter after fertilization; n, nucleus; g, 

 spherical globule; X667. 



Fig. 29. — Vertical section of an archegonium inclosing a young embryo; 

 X470. 



