Botany of the Tenasserim Provinces. Jb 



portion and the stomata, but only in that portion immediately 

 surrounding the callous disc. We may therefore infer, that the 

 numerous papillae are connected with the necessary aeration 

 of the parenchyma, a function which it is well known is occa- 

 sionally performed by hairs. The cuticle of the green por- 

 tion of the limb is remarkably fine. 



The existence of two membranes in the pollen of this 

 plant is very evident when immersed in water, the outer thick 

 yellow coat expels the inner with a jerk, but this inner mem- 

 brane undergoes no change of form during this expulsion. 



The callous spot visible on the surface of the ovarium 

 always points outwards. The opening, or the membranes 

 of the ovule, are very distinct, and the foramen which they 

 form is invariably turned away from the termination of the 

 stigmatic canal, which is exceedingly distinct and lined with 

 papillae. These papillae are, especially towards the apex 

 of the ovary, connected by what appears to be a fine mem- 

 brane. This is, on the side nearest the ovule, reflected on to 

 the short funicle, which it envelopes and terminates by 

 forming a remarkably fine membranous cap which covers the 

 foramen. By this the boyaux are guided into the ovulum, 

 one only, but occasionally two, passing in and reaching to the 

 apex of the nucleus. In one instance of a branched boyau 

 both divisions passed in and reached the same place. The 

 first part of the embryo, that is formed, is its radicular 

 extremity. The vitellus, I may remark, embraces only the 

 plumule, the cotyledons are developed between it and the 

 remains of the nucleus. The term vitellus is, I think, prefer- 

 able to that of quintine, which is obviously only applicable 

 when five membranes exist or have existed. 



Myristicece. — Only one species apparently referable to 

 Loureiro's genus Knema. 



Anonacea. — About eighteen species exist. Among these 

 there are two species of a genus, with the habit and peculiar 

 peduncles of Artabotrys, but in which the contracted portions 

 of the backs of the petals arc club-shaped. 



