Stem of Angiopteris evecta. 525 
Fig. 6. Portion of the superficial vascular tissue from the under side of stem R, 
roots. 
Shaded strands are those belonging to second zone. 
a , strands belonging to leaf II. 
^ >) »> » I* 
e 1) r) » IIL 
c „ ,, v IV. 
d 
>> 
V. 
Fig. 7. Vascular strands of leaf-base from upper side of stem. A, B, branches to 
two other leaves. 
Fig. 8. Vascular strands of leaf-base from lower side of stem. R, root. 
Figs. 9, 10, 11, 12. Series of transverse sections of leaf-base showing branching 
of steles. R, root. Series is that of leaf I in Fig. 6. 
Figs. 13-18. Series of transverse sections from base of stem. Shaded steles are 
those derived from branching of original stele (s) in extreme base of stem. 
Fig. 19. Transverse section of stelar tissue on side nearest the centre of stem. 
P.x, protoxylem; s, sieve-tubes; c, cortex, x 100. Arrow points to centre 
of stem. 
PLATE XXIX. 
Fig. 20. Transverse section of stele in air-root. C, cortex ; E, endodermis; P.x, 
protoxylem; P, phloem ; R, resin-passage ; A, unlignified tracheides. x 100. 
Fig. 21. Transverse section of large stem stele. P.x, protoxylem; s, sieve- 
tubes. x 25. 
Fig. 22. Transverse section of earth-root. E, endodermis. x 40. 
Fig. 23. Transverse section of young stem stele, s, sieve-tubes; p. p, proto¬ 
phloem ; P. X, protoxylem. x 100. 
Fig. 24. Transverse section of air-root, x, peripheral group of lignified 
tracheides; A, unlignified tracheides ; P, phloem ; E, endodermis. x 40. 
Fig. 25. Transverse section of young stem stele. P.x, protoxylem ; p. p, pro¬ 
phloem ; s, sieve-tubes, x 40. 
Fig. 26. Transverse section of small circular stem stele. P.x, protoxylem; 
s, sieve-tubes, x 40. 
Fig. 27. Diagrammatic transverse section of lateral roots. X, xylem rays in 
mother-root; P, pith ; E, endodermis; C, cortex in lateral roots. 
Fig. 28. Transverse section of stelar tissue on outer side, s, sieve-tubes ; P. P, 
protophloem ; X, xylem. x 100. Arrow points to centre of stem. 
Figs. 29, 30. Diagrammatic transverse sections of dichotomising root. A, B, c, 
larger rays of xylem in main root: 
1, 2, products of division of A. 
3 , 4 > ,, » B * 
5 > jj ,, c. 
Fig. 31. Protoxylem elements from stem stele, s, spiral tracheid ; r, reticulate ; 
K, scalariform. 
Fig. 32. Superficial vascular network from convex side of leaf-base, a-b, petiolar 
bundles; S, stipular bundles. 
Pig* 33 * Superficial vascular strands from flat side of leaf-base, a, b, c, d, 
encloses strands which occupy partition joining stipules; p , q t r, s, strands going 
to petiole. 
