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Fig. 333. — Pinus laricio: A, the two spirems of the gamete nuclei within the egg 

 nucleus; a detail is shown in fig. 327 B; B, four-nucleate stage; protcid vacuoles are par- 

 ticularly distinct and, at the top, are two large vacuoles which might be mistaken for 

 pollen tubes; C, third mitosis, showing two of the four dividing nuclei; D and E, eight- 

 celled stage; F, three tiers of four cells each, with nuclei of the lowest tier dividing; C, 

 four tiers of four cells each; //, cells of the suspensor tier elongating; p, pollen tube; ?/, 

 vacuoles; r, rosette tier; 5, suspensor tier; AC, June 25; D-G, July 2; X 104. — From 

 Coulter and Chamberlain, Morphology of Gymnosperms'^ (University of Chicago 

 Press). 



