132 



BOTANICAL GAZETTE 



[FEBRUARY 



2. Staminate strobilus. — (i) The staminate cones are borne in 

 clusters on a fertile branch (text fig. 3); (2) there are 2 abaxial 

 microsporangia on each sporophyll; (3) the pollen is winged (figs. 



1-5)- 



3. Male gametophylc. — The pollen is shed in the 4-celled stage, 

 consisting of 2 polar cells, the antheridial cell, and the tube nucleus 

 (figs. 2-3). 



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Fig. 3. — Above, megasporophylls with scale and bract separate nearly to the 

 base; below, fertile branches bearing groups of staminate strobili; between, 2 winged 

 seeds. 



4. Vascular anatomy. — (1) Resin ducts do not occur in the sec- 

 ondary wood except as traumatic responses (text fig. 1) (n); 

 (2) there are no ray tracheids nor are they "recalled by wound- 

 ing" (11). 



5. Embryo. — (1) There is an extensive cotyledonary tube 

 (figs. 15-20); (2) a central axis extends throughout the primary 

 root (fig. 15). 



