NOTES ON DIPTEROCAEPS. 



Figure 123, young seedling of Shorea castata ; and figure 124, its outer coty- 

 ledon from outside, figure 125, from inside ; figure 126, the placentar cotyledon 

 from the side towards the outer cotyledon 5 and figure 126, the same from the 

 other side, \ nat. size. 



Shorea mater talis, Kidley, has an embryo with the cotyledons- 

 similarly proportioned towards each other, but my material was not 

 quite mature, the embryos lying in a little unabsorbed albumen,, 

 so that their surface was not pressing upon the ovary wall. 



The embryo of Shorea gratissima, Dyer, differs in several 

 points; first of all it is longer than those of Shorea costata and 

 S. materialis; then it is threaded through by a particularly large 

 placenta; and thirdly the placentar cotyledon exhibits a peculiar 

 folding along it. The placentar cotyledon does not attain the apex 

 of the fruit cavity, but approaches it more nearly that in S. costata 

 and S. materialis. Both cotyledons are grooved by ridges of the 

 fruit-wall. A pair of leaves follows the cotyledons, and these, as 

 well as those which follow, possess a peculiar blue green tint which 

 has not been seen in any other species of the order. 



There was no chlorophyll in the cotyledons at seed-fall: all 

 other Shoreas examined possess it. 



/**. 



Figure 128, embryo of Shorea gratissima with the placentar cotyledon 

 towards the observer ; figure 129, the same with the radicle away from the 

 observer, and also in section through the bodies of the cotyledons above the- 

 plumule, showing the folds of the placentar cotyledon. Ail slightly enlarged. 



Figure 130, a seedling with its first leaves ; figure 131, the outer cotyledon 

 from the outside ; figure 132, from the inside ; figure 133, the placentar coty- 

 ledon from the side towards the outer cotyledon ; and figure 134, from the 

 other side. All -b nat. size. 



Jour. Straits Branch 



