358 



CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE L. 



(Reduced about one-fourth). 



Fig. 7. Longitudinal section, not median, of young flower showing a lodic- 



ula, and stamen: X 320; lettered as above. 

 Fig. 8. Cross-section of a young stamen: X 320. 

 Fig. 9. Cross-section of a somewhat older stamen than that represented in 



the preceding figure: X 320. 

 Fig. 10. Cross-section of stamen showing pollen mother-cells (pm): X 320. 

 Fig. 11. Longitudinal section of stamen of the age shown in the preceding 



figure: X 320. 

 Fig. 12. Section of pollen grain showing one vegetative and two generative 



nuclei: X 320. 

 Fig. 13. Longitudinal section of ovule: X 320; o, outer integument; in, 



inner integument; ar, archesporial cell. 

 Fig. 14. An ovule with nucellus (nu); and archesporial nucleus that has 



divided once (forming two sister nuclei): X 320. 

 Fig. 15. Four sister nuclei: X 320. 



