NOTES ON DIPTEROCAKPS. 



73 



The next Shorea to be illustrated is Shorea sericea, Dyer. 

 Like Shorea rigida, Brandis, from which as a species it is doubtfully 

 distinct, it has nearly equal cotyledons, the outer only just the 

 larger, of the same shape, as those of Shorea rigida (vide this 

 Journal No. 76, 1917, p. 164), One case of a seedling with three 

 nearly equal cotyledons was found in Penang. 



Figure 186, the fruit of Shorea sericea germinating, § nat, size ; figure 187 

 3eedling with its ootyledons in the position that they assume, slightly reduced 



Figure 188, an embryo of Shorea sericea seen with the radicle away from 

 the observer ; figure 189, the outer cotyledon seen from the outer side ; and 

 figure 190, the inner cotyledon seen from the side away from the outer coty- 

 ledon. Figures 189 and 190, \ nat. size. 



Shorea sericea flowered in 1918 in Penang a couple of months 

 later than the other Shoreas associated with it. 



The last of the seedling Shoreas to be illustrated here is S. 

 oracteolata, Dyer. Other species illustrated above have thick coty- 

 ledons: they have been arranged into a series commencing with 

 those having cotyledons markedly unequal, and ending with those 

 having cotyledons equal. 8. oracteolata does not fit into the series, 

 but like 8. leprosula has flat cotyledons. Attention was called 

 to them in this Journal No. 76, 1917, p. 164, where the cotyledons 

 of S. leprosula were described. Unlike 8. leprosula it has a large 

 flower directed earthwards. 



R. A. Soc, No. 81, 1920. 



