66 



NOTES ON DIPTEROCARPS. 



0. 

 ® 



Figure 110, embryo of Baiano- 

 carpus penangianus seen with the 

 radicle remote from the observer ; 

 figures 111, and 112, the cotyledons : 

 in figure 112, the placentar cotyledon 

 is toward the observer, nat. pize. 



10$. 



Figure 106, fruit of Balanocarpus 

 penangianus, germinating, \ na *. 

 size ; figure 107, section through the 

 embryo showing the radicle central 

 between the equal lobes of the coty- 

 ledons ; figure 108, section at the 

 middle showing the lobes of the 

 placentar cotyledon at this level 

 rather smaller than those of the 

 outer cotyledon ; figure 109, section 

 through the plumule showing the 

 placentar cotyledon here the smaller. 



The cotyledons are of a deep red, nearly equal, and stand 

 parallel on short petioles as drawn (figure 111). A pair of bright 

 green leaves follow them having remarkably long aeuminations : 

 so long are these aeuminations that when the leaf is just expanding 

 they make one-half of its length, and at maturity one-third. The 

 stem is wiry. 



Xo Malayan Dipterocarp has been observed with a more easily 

 recognised, seedling than has Balanocarpus penangianus. 



Hopea, section Euhopea. 



Hopea Curtisii, King, has a seedling in many respects like that 

 of some species in the genus Shorea. The fruit is globose as figure 

 113 indicates. The naked embryo seen with the radicle re- 

 mote from the observer is as in figure 114, or germinating with the 

 placentar cotyledon towards the observer as in figure 115. 



Figure 113, A fruit of Hopea Curtisii, ^ Nat. size ; figure 114, an embryo 

 with the radicle away from the observer, and figure 115, germinating, with the 

 placentar cotyledon, towards the observer, x 1. 



The outer cotyledon is considerably larger than the placentar 

 cotyledon and alone reaches the apex of the ovary; figures HT r 

 118 119 and 120 show by how much it is the larger. The coty- 

 ledons are of an orange-claret colour. They become horizontal in 

 the seedling: and a pair of leaves follow them. 



Jour. Straits Branch 



