352 



BOTANICAL GAZETTE 



[NOVEMBER 



in February in 1904, during unusually warm weather, indicating 

 that in this form the sporogenous tissue remains in the mother cell 

 stage until spring. It would be of interest to know the behavior 

 in the extreme northern part of the range of T. canadensis, as it is 

 possible that in regions farther to the north the microspore stage 

 might not be reached before winter. The microspore mother cell 

 stage is the winter condition of Torreya calif ornica (20) in England 



Figs. 7, 8. — Median longitudinal sections of older strobili: fig. 7, at time of 

 completion of sporangium wall, showing oval areas of young sporogenous tissue; 

 vascular tissue of axis and upper scales, shown in black, embryonic vascular tissue of 

 upper portion in outUne; fig. 8, winter condition of strobilus, showing globular char- 

 acter of bud and microspores; vascular tissue as in preceding figure; X36. 



and of T. taxifolia (5) in Florida. During this development the 

 strobilus has grown considerably in size (cf. figs. 7 and 8), becoming 

 more pronouncedly globular, and it remains in this condition until 

 the renewed growth of spring takes place. 



No cases of abortive sporangia were found, and it seems a safe 

 assumption that a sporangium develops from each initial or initial 

 group. The adult sporangia show some variation in size, but not 

 enough to indicate any tendency to abortion of any. of them. This 



