Index . 
IX 
Figures. 
31-35* 
36-39* 
40-49. 
5°— 55* 
56-66. 
1-9. 
1, 2. 
3* 
4- 
5- 
1. 
2. 
3* 
4* 
. 5* 
6 . 
7* 
8 . 
9* 
10. 
11. 
1-15. 
16-28. 
29. 
30-42. 
43-46. 
47-58. 
59-63* 
64-66. 
Leaves of Iris (Sections Xiphium and Juno) (Arber) . 
Bifacial leaves of Moraea (Arber) .... 
Leaves of Ixioideae and phyllodes of Acacia (Arber) . 
Foliated leaves (Arber) 
Leaves of Crocoideae (Arber) ..... 
1-7. Penetration of the infecting hyphae through the epidermal intercellular spaces 
8. Ditto directly through the lumen of the epidermal cell. 9. Multinncleate 
mycelium in the tissues of the leaf-sheath (Dastur) . 
Variations in the Flowers of Stachys sylvatica, Linn. (Cutting) 
PAGE 
3*3 
315 
318 
321 
3M 
405 
410 
4i3 
415 
416 
43i 
43i 
433 
433 
435 
435 
435 
436 
436 
436 
Reconstruction of the stele of Cone A of Equisetum sylvaticum (Browne) 
Ditto of the stele of Cone b of E. sylvaticum (Browne) 
Ditto of the stele of Cone a of E. debile (Browne) 
Ditto of immature stele of Cone B of E. debile (Browne) 
Ditto of the stele of Cone c of E. debile (Browne) 
Ditto of the stele of Cone d of E. debile (Browne) 
Ditto of immature stele of Cone e of E. debile (Browne) 
Ditto of the stele of Cone a of E. variegatum (Browne) 
Ditto of the stele of Cone b of E. variegatum (Browne) 
Ditto of the stele of Cone C of E. variegatum (Browne) 
Ditto of the stele of Cone D of E. variegatum from below insertion of annulus to 
a point above level of first whorl of sporangiophores (Browne) . . . 446 
Section of internodal bundle from the axis of the cone of E. limosum, showing con- 
tinuity of some of the metaxylem with the protoxylem (Browne) . . . 447 
1. ‘ Seedling A.’ A syncotyl combining tetrarchy at the base of the hypocotyl with 
extremely intimate syncotyly. 2 a, 2 b. ‘ Seedling B.’ A syncotyl in which the 
hypocotyl is diarch ; 2 b shows the venation of the compound lamina. 3, 4. Syn- 
cotyls showing tetrarchy. 5. A syncotyl showing a triarch hypocotyl ; the tap- 
root was pentarch. 6 a, 6 b. Seedling with markedly unequal cotyledons. 
7. A syncotyl with unequal cotyledons. 8. Large ‘ Type 2 ’ seedling in which 
the epicotyl has not developed. 9, 10 a, 10 b. Salver-shaped amphisyncotyls, 
‘Seedlings C and D’ respectively. 11-14. Goblet-shaped amphisyncotyls. 
15. ‘Seedling H’) Holden and Daniels) 463 
16-20 ‘ Seedling A’, 21-28 ‘Seedling B\ Both show a fusion of the cotylar midribs, 
these behaving in transition like a single normal midrib (Holden and Daniels) 464 
Transverse section of stele, showing the origin of a root-pole, r, de novo (Holden 
and Daniels) 465 
30-34 show the transition in a ‘ Type 2 ’ seedling in which tetrarchy has resulted 
from the production of one new pole and the independence of one lateral. The 
new pole does not give rise to a lateral root at the base of the hypocotyl. 35-38 
show a ‘Type 1 ’ seedling with similar transition features, a, b, c, d poles, repre- 
sented in the hypocotyl, e pole present from the base of the tap-root onwards. 
39-42 show the transition in a ‘ Type 1 ’ seedling, in which the three hypocotyle- 
donary poles, a, b, c , are reinforced in the tap-root by two additional ones, d , e 
(Holden and Daniels) 468 
A ‘ Type 1 ’ seedling in which the tap-root has been destroyed (Holden and 
Daniels) 469 
47-52 show the transition phenomena in a seedling in which the cotyledons are 
markedly unequal. 53-58 show the transition in a seedling in which cotyledonary 
inequality and syncotyly are combined (Holden and Daniels) . . . 471 
Transition in a ‘ Type 2 ’ seedling. 60 shows the effect of partial roofing-in of the 
plumule on the side of the base of the petiole (Holden and Daniels) . . 474 
An^amphisyncotyl in which partial roofing-in of the plumule has occurred, and in 
which the cortex shows splits due to tissue tensions (Holden and Daniels) . 475 
/ 
