Oliver. — On Sar codes sanguined , Torr. 325 
Fig. 18. Longitudinal section of the upper part of the ovary, showing the ring- 
like depression around the base of the style, ov, ovarian cavity ; r, annular depres- 
sion ; c, style- canal. (8/1.) 
Fig. 19. Much enlarged view, showing the annular depression in a longitudinal 
section similar to that represented in Fig. 18, and its relation to the cavity of the 
ovary, b s, base of style ; r, annular depression ; ov, cavity of ovary ; ow, wall of 
ovary; x, cells which in dehiscence break down. (60/1.) 
Fig. 20. A ripe fruit laid open so as to show the bi-lobed placentas covered with 
very numerous minute seeds, the circumscissile method of dehiscence, and the 
rupture of the dissepiments ; d, region of dehiscence. 
Fig. 2 1, A,B, C, D, E,F G, and II. A series of diagrams representing the placentas 
and their relation to one another as shown in a number of transverse sections of the 
stigma, style and ovary. A is through the stigma ; B through the style, with central 
cavity the style-canal ; C is through the insertion of the style on the ovary, and so 
on to H , which is cut about half-way down the ovary. It is seen that in the upper 
part of the ovary the placentas, which are directly continuous with the ridges 
projecting into the cavity of the style, are free from one another ; that fusion occurs 
lower down ( G ), and that in the whole of the lower part of the ovary they are 
completely consolidated ( ' H ). (Enlarged.) 
Fig. 22. Flower of Monotropa glabra dissected so as to show the nectaries at 
the base of the ovary, p, a petal remaining in situ ; s s , insertion of sepals ; 
n n , nectaries, each occurring as an appendix at the base of a carpellary lobe ; 
p s, petaline stamens. (Enlarged.) 
Fig. 23. Floral diagram of Sarcodes sanguinea. 
Figs. 24-40. Series of drawings illustrating the development of the ovule and of 
the embryo-sac up to the time of formation of the embryo, a, archesporium ; 
a e s, accessory embryo-sac ; ant , antipodal cells ; c c, cap-cells ; d n, definitive 
nucleus of embryo-sac ; emb, embryo ; end , cells of endosperm ; e s, embryo-sac ; 
int, developing integument ; o, egg-cell ; suspensor ; syn, synergidae. (Enlarged.) 
Fig. 41. A small portion of a root, showing its habit of branching as seen under 
a low magnifying power. (5/1.) 
Fig. 42. A somewhat diagrammatic sketch of a longitudinal section of the 
apex of a rootlet, showing the fungal investment, the various layers of the root-cap, 
and the exogenous origin of a new lateral root, c, cortex ; ep , epidermis ; f, the 
investing fungal hyphae in which are embedded the outer dead layers of the root- 
cap (dark) ; pi, plerome of root ; pi', plerome of lateral exogenous root ; rc, root- 
cap (with calyptrogen) ; rc , root-cap of exogenous root. (100/1.) 
Fig. 43. Longitudinal median section of a root-apex, showing origin of layers of 
root-cap from dermatogen. c , cortex ; dc, dermato-calyptrogenic layer ; ep, epi- 
dermis ; pi, plerome ; rc, root-cap ; rc, youngest layer of root-cap. (130/1.) 
Fig. 44. Radial longitudinal section through the outer part of the cortex, epi- 
dermis, and investing fungal hyphae of a root, a and b, side walls of epidermal cells 
with hyphae on surface ; c, cortical cells (some containing starch-granules) ; e, 
epidermis ; h, investing fungal hyphae ; n, rod-shaped nuclei of epidermal cells ; 
rc, old layers of the root-cap retained in position by the investing hyphae. (300/1.) 
Fig. 45. Tangential longitudinal section through the epidermis of a root, showing 
e, the epidermal cells; h , the mycelium investing each cell. (300/1.) 
