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Explanation of plates VIII— XVII. 



All figures drawn with the aid of a camera lucida. 



Plate VIII. 



Sections of microsporophylls showing successive stages in development of 

 microsporangia. Sections cut radially through staminate cones. 

 Fig. 5. Archesporial enitials. X 285. 



Fig. 6. First periclinal division of archesporial cells. X 285. 

 Fig. 7. More advanced stage in development of archesporium. X 285. 

 Fig. 8. Differentiation of archesporium into primary sporogenous cells, 

 tapetum, and inner wall layer. X 285. 



Fig. 9. Sporangium just before synapsis. X 285. 

 Fig. 10. Sporangium during synapsis. X 285. 



