532 Sinnott and Bailey . — The Significance of the ‘ Foliar Ray ’ 
6. The evidence therefore seems still to support our view that the 
herbaceous stem in general is essentially similar to the first year’s growth 
of its woody prototype, differing mainly in the possession of a relatively 
thinner woody ring. Where the rays are small, the vascular cylinder in 
both woody plants and herbs is practically continuous ; where wide and 
high rays occur, they break up the stele into separate strands in both types. 
DESCRIPTION OF PLATES XVIII AND XIX. 
Illustrating Messrs. Sinnott and Bailey’s paper on the Significance of the * Foliar Ray’ in the 
Evolution of Herbaceous Angiosperms. 
PLATE XVIII. 
Fig. i. Liquidambar , Tree. Transverse section of stem, showing narrow rays and unbroken 
fibro-vascular cylinder, x 15. 
Fig. 2. Plat anus, Tree. Transverse section of stem, showing wide rays and many-bundled 
type of stele, x 27. 
Fig. 3. Lonicera , Vine. Transverse section of stem, showing narrow rays and unbroken 
fibro-vascular cylinder, x 32. 
Fig. 4. Clematis , Vine. Transverse section of stem, showing wide rays and riiany-bundled type 
of stele, x 14. 
Fig. 5. Digitalis , Herb. Transverse section of annual stem, showing slender unbroken fibro- 
vascular cylinder, which consists almost entirely of primary elements, x 1 1. 
Fig. 6. Artemisia, Herb. Transverse section of stem with slight cambial activity, showing 
many-bundled type of stele, x 24. 
Fig. 7. Drimys , Tree. Transverse section of node, showing increase in the number and size 
of the rays in the leaf-trace segment, x 55. 
Fig. 8. Eupatorium , Herb. Transverse section of woody stem, showing wide rays and many- 
bundled type of stele, x 33. 
Fig. 9. Plantanus , Tree. Portion of Fig. 2 more highly magnified, x 55. 
Fig. 10. Dillenia , Tree. Transverse section of internode, showing leaf-trace and wide {multi- 
seriate) flanking rays, x 60. 
Fig. 11. Digitalis , Herb. Portion of Fig. 5 more highly magnified, showing xylem, phloem, 
and jacketing layer of sclerenchyma. x 33. 
Fig. 12. Dillenia , Tree. Transverse section cut just below the node, showing small lateral 
leaf-trace and fusion of flanking rays, x 60. 
* PLATE XIX. 
Fig. 13. Dillenia , Tree. Transverse section of node, showing large lateral leaf-trace confronted 
by ‘ foliar storage tissue x 50. 
Fig. 14. Campanula , Herb. Transverse section of node, showing absence of ‘foliar storage 
tissue ’. The entering leaf-trace is confronted and flanked by prosenchymatous tissue, x 30. 
Fig. 15. Cercidiphyllum , Tree. Transverse section of node, showing decrease of vessels and 
increase of rays in vicinity of entering leaf-trace, x 38. 
Fig. 16. Campanula , Herb. Tangential longitudinal section of slender herbaceous stem, 
showing entering leaf-trace and parenchyma of foliar gap. The confronting and flanking tissue is 
prosenchymatous and ‘ foliar storage tissue 5 is absent, x 20. 
