134 



Moore : The study of winter buds 



popiilifolia^ Salixfragilis^ and Salix alba^ v 

 ber of leaves and the axillary buds absent. 



Fagti 



axis 



( 



show any change whatsoever until the April swelling which pre- 

 cedes the unfolding of the bud. Other cases in which the axil- 

 lary buds are present in rudimentary form during the winter are 



F^ 



americana (figures 34 and 

 V Ulnms americana Tfigur 



Q 



7 



(figure 51), and Syringa vulgaris (figure 8). 



Mere areas of cells, which are rich in protoplasm and are 

 stained more deeply than the surrounding tissue, occur in the leaf 

 axils of Liriodendron Tidipifera^ Salix fragilis^ Salix alba, and 



Acer platanoides. No indications of axillary buds appear in the 



. 



Figure G. Tilia vulgaris. Curves of growth of the buds in length and diameter 



Philadelphiis. 

 In the flower 



Hippocastantim^ Pice a 

 mris, Popiiltis tremuloi 



popidifoli 



bud, according to Coulter 



(1903), the spore-: 



place at the beginning of the rest period. 



and Chamberlain 



In an embryological study of Ulmus americana, Shattuck 



(1905) 



the cells within microsporangia in the mother-cell 



stage in the early part of February and assumed that they passed 

 the winter in this stage. 



