Betts. — Aufecnif/r/i/ of Plants of I'tridoiite Bdf . Xelson. 



155 



xylem consists of vessels of small diameter with thickened walls and of 

 wood-fibres, with very thick walls and small cell-cavities. 



Medullary rays are numerous and are uuiseriate ; they have thickened 

 lignified walls, and contain tannin. A few of the cells contain starch. 

 The pith is wide, and is solid. The cells are small, and have thickened 

 lignified walls. Many of these cells contain tannin. The cells are loosely 

 arranged, with large air-spaces between them. 



23. Dracophyllum rosmarinifolium R. Br. 



Groivfh-form. — This plant is a depressed or prostrate much -branched 

 rigid woody shrub, 3-18 in. high ; the branches are stout, spreading, leafy 

 at the tips. The leaves are erect, rigid, and curved, |-f in. long ; the 

 sheathing base is short, ^ in. wide; the blade is ^^^ in. wide at the base, 

 very thick and coriaceous, convex at the back and flat in front ; the ti]) 

 is trigonous. 



Axalonii/. 



Leaf (fig. 23). — The structure of the leaf is the same as in D. Urvillecwitni, 

 the only differences being that the leaf is narrower and thicker. There are 

 3 large bundles and 4 smaller ones. Tannin idioblasts in the mesophyll 

 are more abundant than in D. UrvUIeanum. 



2G >."ttrhTh?^ 



KT. 



CI h r. d e 



Fig. 23. — Dracop}ujllv,m rosmarinifolium. Tran&verse section of leaf (diagrammatic) 



( X 36). a, bristles ; b, stereome ; c, vascular bmidle ; d, mesophyll. 

 Fig. 24. — PentncJwndra pumila. Transverse section of leaf (diagrammatic) ( X 36). 



a, cuticle ; b, epidermis ; c, palisade tissue ; d, sprmgy tissue ; e, vascular 



bundle. 

 Fig. 25. — Pentachondra jnnnila. Transverse section through upper epidermis (X 175). 



a, cuticle ; b, thickened cell-wall ; c, cell-cavity. 

 Fig. 26. — Pentachondra pumila. Transverse section of lower epidermis (X 175). 



a, stoma. 

 Fig. 27. — Pentachondra j>umila. Transverse section of stem (diagrammatic) ( X 36). 



a, cork ; b, cortex ; c, radiating lines of suberized cells ; d, phloem ; 



", xvlem. 



Stem. — On the outside there are dead brown cells, the remains of the 

 old epidermis, cortex, and pericycle fibres. 



The cork forms a wide zone of small compactly arranged cells. The 

 cells have thick walls, which in the inner part of the zone are lignified as 

 well as suberized. 



