72 DESCRIPTIVE CATALOGUE 



The minute a.ris contains only pith, xylem, and phloem, as 

 its outer tissues are merged in the leaf-bases. 



Thvpith consists of about 12 very small, but relatively to the 

 xylem large, cells (10-15 p in diameter) of roundish shape and 

 only slightly thickened walls (j>., PI. II, fig. 3). No stone-cells 

 are visible. 



The xylem is primarily arranged in small bundles, 5 or G in 

 number, consisting of four or five elements each ; outside, this 

 secondary growth forms a solid ring of wood 6 elements deep 

 in radial direction (.r, PI. II, fig. 3). The largest of the 

 secondary tracheids measures 8-9 \L in diameter. 



Medullary rays run throughout the wood, and about three 

 cells span the whole radius of the wood. 



Phloem is relatively well developed, and forms a zone nearly 

 as thick as the secondary wood. The soft cells are crushed, 

 but a few stone-cells can be seen clearly, and seem to alternate 

 with them. 



Longitudinal sections are not available, and the oblique 

 one does not reveal the nature of the pitting on the vascular 

 elements. 



A small, obliquely cut leaf-trace, which appears to be a single 

 bundle, can be seen on one side passing out to the largest leaf- 

 base. 



The leaves are cut at various levels, and therefore appear to 

 have some variety in shape and character. So far as cnn be 

 judged from the small number of sections, the central large 

 resin-canal dies out at the base of the leaf, and here also the 

 transfusion-tissue forms one large, tangentially extended mass 

 (see PL II, fig. 3) before the leaf- trace is completely free from 

 the axial wood. Higher up, what may be considered a typical 

 leaf-section (see PL II, fig. 2) shows a large central resin-canal 

 with a patch of transfusion-tissue on either side of it, a small 

 single vascular strand opposite, and a stout curved under surface 

 towards which the palisade-layer radiates (see text-fig. 10 & 

 PI. II, figs. 1-3). 



The vascular bundle is very minute, and can hardlj' be made 

 out in a satisfactory manner. I can only see four tracheids and 

 a little mass of blackened tissue round them. 



The transfusiOH^tiiavi is well developed, first as a single curved 

 band of large thick-walled elements (see tr., PI. II, fig. 3), 



