480 DR. P. GROOM AND MR. W. RUSHTON ON THE STRUCTURE 
A typical fusiform ray (fig. 19) consists in the centre of a resin-duct, 
surrounded by a flattened epithelium, around which in turn is a second 
similar layer. Above and below sueceed (about four) tiers of wide thin- 
walled starch-containing parenchyma, arranged in a biseriate manner. Next 
to these are several (2-5) tiers of thick-walled starch-containing parenchyma, 
arranged in а uniseriate manner, The ray is completed at its margin by 
1-5 tiers of uniseriate ray-tracheids, Internal ray-tracheids may interrupt 
the tiers of thick-walled parenchyma. Less frequently the thin-walled 
parenchyma is more abundant: for instance, one ray in tangential section 
consisted successively of 1 tracheid, 2 uniseriate thick-walled parenchyma- 
cells, 4 uniseriate and two tiers of 2-3-seriate thin-walled parenchyma-cells, 
2 layers of flattened cells around the duct, 1 3-seriate and 1 2-seriate 
and 1 l-seriate tiers of thin-walled parenchyma-cell, a solitary thick-walled 
parenchyma-cell, and 2 uniseriate ray-tracheids. 
PINUS KHASYA, Royle. 
This three-needled thick-barked species occurs in the Khasia and Naga Hills, 
as well as in several regions in Burma, at altitudes varying from 7,000 feet 
to the comparatively low one of 2,500. By Kurz it is described as growing in 
Burma in dry hot woods forming pure forests or mixed with trees belonging 
to the “upper dry forests." These pine-woods are well-lighted, rich in 
epiphytes (especially orchids and lichens), but very poor in lianes. The 
epiphytes suggest considerable atmospherie humidity at least periodically. 
The tree thus seems capable of living on dry sunny sites and in a climate 
ranging from temperate to sub-tropical or even tropical. On the Khasia 
Hills it does not grow in the regions of very great rainfall ( Hooker). 
A. Macroscopic FEATURES (naked eye), 
The light-coloured * pale brown to red" (Gamble) wood shows distinct 
annual rings, which in our specimen are somewhat sinuous. In a specimen 
of which Gamble gives the measurements there were six annual rings to the 
inch radius ; ours showed 3:2. The transition from the spring-wood to the 
summer-wood is gradual. and the distinction between these two is not great. 
The numerous resin-duets of this very resinous wood are most abundant in 
the outer half of the annual ring, in fact they are almost lacking from the 
inner third or half: in longitudinal views they form well-marked brown 
stripes. The medullary rays faintly suggested by ill-defined radial striation 
in the eross-section, form a delicate silver grain on the radial section. 
