324 Oliver . — On Sarcodes sanguined , Torr. 
EXPLANATION OF FIGURES IN PLATES XVII, 
XVIII, XIX, XX, XXL 
Illustrating Mr. F. W. Oliver’s paper on Sarcodes sanguinea. 
Fig. i. Life-size portrait of the plant at the time of flowering in natural colours. 
Only a portion of the roots of the plant is shown. Drawn by Mr. John Allen. 
Fig. 2. A single flower with two sepals removed, k, calyx ; c, corolla. Natural 
size. 
Fig. 3. View of the interior of a flower after removal of part of corolla, showing 
the stamens and anthers with porous dehiscence, the nectaries, ovary and stigma. 
k, calyx; c, corolla; st, stamen; n, nectary. (2/1.) 
Fig. 4. A single flower-bud with its subtending bract attached. To show the 
curving of the bract round the bud. br , bract. Natural size. 
Fig. 5. View of an anther seen from the dorsal (outer) side. Right and left are 
the two halves of the anther adnate to the filament. The letters A, B, C, indicate 
the heights at which the corresponding sections in Fig. 6 were made, cn, con- 
nective ; fi shows position of sclerized layer at margin of pore ; fl , filament ; p , 
pore. (12/1.) 
Fig. 6, A, B, C. Transverse sections of anther cut at heights indicated in 
Fig. 5. The dotted lines indicate the partitions which break down in development. 
v, ventral side; d, dorsal side. (12/1.) 
Fig. 7. Transverse section of part of an anther more highly magnified to show 
the sclerized strand running in the wall just to the outside of the dorsal pollen-sac. 
cn, connective ; d /, dorsal pollen-sac ; f, sclerized strand ; p, remains of broken- 
down partition ; v l, ventral pollen-sac. (120/1.) 
Fig. 8. Transverse section of a younger anther, showing first rupture of partition 
between dorsal and ventral pollen-sacs, d, dorsal ; v, ventral side. (18/1.) 
Fig. 9. A pollen mother-cell containing a tetrad of pollen-grains, each as yet 
with a single nucleus. The fourth grain not shown. 
Figs. 10, 11, and 12. Single pollen-grains after division of contents into a larger 
and a smaller cell. 
Figs. 13 and 14. Somewhat later stage in development of pollen. The cell- 
protoplasm no longer shows division into two masses. The two nuclei show 
characteristic differentiation, one being spindle-shaped, the other globular. 
Fig. 15. Showing division of contents of pollen-grain into equal portions. Not 
frequently met with. 
Fig. 16, a, b, c, d, e. Callus-like thickenings in the pollen-tubes. (400/1.) 
Fig. 17. Longitudinal section through the ovary, showing the fleshy axile 
placenta, the ovules and the style-canal, and the method of communication between 
it and the various chambers of the ovary, c, corolla ; ch , chinks leading from style- 
canal into ovarian chambers ; k , calyx ; n, nectary ; p, placenta with ovules ; 
r, annular invagination surrounding base of style, by the agency of which cir- 
cumscissile dehiscence is afterwards effected ; s c , style-canal ; st, insertion of 
stamen. (Enlarged several times.) 
