DESCRIPTION OF PLATES. 



Plate I. 



Fig. 1. Photograph of a plant of X. quadrangulata . Numerous 

 adventitious roots are noticeable. Above them a region of stem 

 protected, only by a resin sheath. Then follows a zone protected 

 by the persistent leaf bases, the ends of which were charred by fire. 

 Above this again the laminas of the leaves were persistent, though 

 dry and dead ; since they were pendent owing to the strong 

 reflexion of their bases they were cut away to expose the trunk. 

 The leaves remaining were all green and functional. Diameter of 

 trunk immediately above roots, 14 cm. 



Fig. 2. Longitudinal section of trunk at apex. The increasing 

 accumulation of resin at the leaf bases is noticeable as one descends 

 the trunk, particularly on the right hand side. At A the cambium 

 zone in the cortex is clearly seen. 



Plate II. 



Fig. 1. Transverse section of trunk about 4 cm. above the 

 point of emergence of the uppermost roots, in the region of the 

 stem protected by the resin layer only. The majority of the leaf 

 traces are cut transversely; a few can be seen passing out through 

 the stem, simulating the appearance of medullary rays. The 

 cambium zone and cortex is best seen on the left of the figure at 

 the bottom. Diameter of the stem, about 15 cm. 



Fig. 2. Transverse section of stem at a point some 5 cm. above 

 that shown in the previous figure, passing through the region pro- 

 tected by the downward-projecting leaf bases at the top of the 

 figure. These are seen cut in oblique section and cemented 

 together by resin. Diameter of section (stem and leaf bases),. 

 about 20 cm. 



N.B. — Figs. 1 and 2 of this plate are photographed on different 

 scales. The diameter of the stem in each case is approximately 

 the same — about 12 cm. 



Plate III. 



Fig. 1. Portion of longitudinal section shown at A. pi. i. r 

 fig. 2, photographed on a larger scale. The leaf traces in the 

 ground tissue of the stem, the cambium, and cortex are clearly 

 shown. The ruddy brown of the resin shows almost black in con- 

 trast to the white of the cortex at the proximal ends of the leaf 

 bases. x^. 



Fig. 2. Portion of section shown in pi. ii., fig. 1, photographed 

 on a larger scale. The resin sheath with its irregular abutment 

 on the cortex is clearly seen. The ends of several leaf traces will 

 be noticed, though the leaves themselves and leaf bases have long 

 rotted awav. The cambium is best seen at C. 



