NOTES ON DIPTEROCARPS. 



57 



Figure 42, the germinating fruit of Dryobalanops aromatica in vertica- 

 median section, showing oal. = a calyx lobe : f . w. = fruit wall : pi. = plal 

 centa: i. cot. inner or placentar cotyledon : o. cot. = outer cotylepon, cut in three 

 places. Nat. size. Figures 41, 42, 43 and 44, sections through the embrio at 

 various levels showing how the outer cotyledon enwraps the placenta coty- 

 ledon and the process of the placenta. 



The embryo soon frees itself from the fruit wall and seed- 

 coats, uncurling as in figure 45. 



Figure 45, the seedling of Dryobalanops aromatica showing the outer 

 cotyledon half expanded, \ nat. size. 



The lesser or placentar cotyledon becomes as horizontal as the 

 larger, and a rather long wiry stem grows upward bearing first a 

 pair of leaves and then, closely approximated to this pair, another 

 pair before alternate leaves succeed, as shown in figure 46. If the 

 reader will turn back to figures 34-37, he will at once see how dis- 

 similar is this plantlet to the seedlings examined of the genus 

 Dipterocarpus. 



ft. A. Soc, No. 81, 1920. 



, 



