462 BOTANY OF THE CEYLON PATANAS. 
EXPLANATION OF THE PLATES. 
w.e., upper epidermis ; /.c., lower epidermis; s¢., stoma ; cut., cuticularized 
part of the outer epidermal wall ; fv., fibrovascular tissue. 
Puats 11. 
Fig. 1. Bupleurum mucronatum. Section of leaf. x 200. 
Fig. 2. Hedyotis Lawsonie. Section of leaf. x 200. 
t.s,, tannin-sacs (shaded). 
Fig. 3. Hypericum mysorense. Section of leaf. x 200. 
Fig. 4. Oldenlandia Heynii. Section of leaf. x 200. 
r., raphide-cell in section. 
Fig. 5. Evolvulus alsinoides. Section of leaf. x 200. 
Fig. 6. Didymocarpus Humboldtiana. Section of leaf. x 200. 
gh., glandular hair; ch., chloroplasts in lower epidermis. 
Fig. 7. Psidium Guyava. Section of leaf. x 200. 
Fig. 8. Heptapleurum stellatum. Section of leaf. x 100. 
cr., Cluster crystals of calcium oxalate. 
Fig. 9. Heptapleurum stellatum. Section of stoma. x 400. 
gc. guard-cell ; l.e., lower epidermal cell; cwt., cuticularized part 
of outer wall of epidermis ; sp., spongy mesophy]l-cells. 
Fig. 10. Mussenda frondosa. Section of Jeaf. x 200. 
Z.s., tannin-sacs (shaded); ¢w., thickened wall of spongy cell. 
PuatE 12. 
Fig. 1. Hedyotis verticillaris. Section of leaf. x 200. 
Fig. 2. Osyris arborea. Section of leaf. x 200. 
Fig. 3. Atylosia rugosa. Section of leaf. x 200. 
t.s., layer of tannin-sacs (shaded) ; h., 3-celled hairs, only basal parts 
of them shown on upper surface. 
Fig. 4. Rhodomyrtus tomentosa. Section of upper epidermis. x 400. 
- cut., cuticularized part of outer wall; cp., cuticularized prolongation 
into side-walls ; mes., commencement of mesophyll. 
Fig. 5. Gaultheria fragrantissima. Section of upper epidermis. X 400. _ 
cut., cuticularized part of outer wall ; cp., cuticularized prolongation 
into side-walls; pal., upper parts of palisade-cells. 
Fig. 6. Hypericum mysorense. Section of upper epidermis. X 400. 
cut., cuticularized part of outer wall; /w., ordinary lateral wall ; 
fw.,, special lateral wall with cuticularized prolongation, P- ; 
mes., commencement of mesophyll. 
Fig. 7. Hypericum mysorense. Surface view of upper epidermis. X 400. ; 
st., stomata faintly shown, being sunk somewhat; oc, original 
epidermal cell undivided, oc.,, divided into two cells by special wall, 
0¢.», divided into three cells by two special walls at right angles to 
one another ; cp., cuticularized core of special lateral walls. ; 
Fig. 8. Polygonum chinense. Section of upper epidermis, showing mucilage- 
cell. x 400. 
mwe., lumen of mucilage-cell ; i.w., thick inner wall containing the 
