CONIFERALES 



67 



cata Canadensis are in the mother-cell stage in October, but how 

 much earlier they reach this stage he did not discover (Fig. 52). 

 In this condition the sporangia pass the winter, and during the 



FIG. 52. Winter condition of microsporangia : A, cross section of sporangium of Pinus 

 Laricio, collected October 1st ; E, same, collected January 3d ; <7, same, collected 

 April 4th ; Z>, sporangium of Taxus baccata Canadensis, collected October 1st. 

 After CHAMBERLAIN. 



following spring (about May 1st in the case of P. Laricio) the 

 mother cells pass through the reduction division. 



THE MEGASPORA^GIUM 



The structures associated with the megasporangium in Coni- 

 fers have long been under discussion, and the literature of the 

 subject is very extensive. There is such great diversity among 

 the various groups that it is difficult to discover any interpreta- 





