354 



BOTANICAL GAZETTE 



[may 



Fig. 13. — Longitudinal section of the distal part of the megasporophyll of 



Microcachrys. 



Fig. 14. — Transverse section of same, showing ovular and main supply 



bundles in transverse section. 



Fig. 15.— Megasporangium of Microcachrys in transverse section. 



Fig. 16.— Sporophyll and megasporangium with abnormally thick integu- 

 ment, in transverse section. 



Fig. 17—Tsuga canadensis; bract, scale, and ovule in longitudinal section. 



PLATE XXV 



Fig. iS—Tsuga canadensis; transverse section of bract, scale, and ovules at 

 the point of origin of the ovular bundles. 



Fig. 19.— The same; a magnification of the ovular supply of the right ovule 



in fig. 18. 



Fig. 20.— The same; supply bundle farther up. 



Figs. 21, 22.— Respectively, longitudinal and transverse sections of micro- 



sporophyll of Ceratozamia mexicana. 



Fig. 23. 



fig 



