2 
‘ol aie ie a 
1909] PACE—GAMETOPHYTES OF CALOPOGON 135 
5. Cannon, W. A., A morphological study of the flower and embryo of the wild 
oat, Avena fatua. Proc. Calif. Acad. Sci. III. 1: 329-364. pls. 49-53. 1900. 
- COULTER, J. M., Relation of megaspores to embryo sacs in angiosperms. 
Bot. GAzETTE 45:361-368. 190 
COULTER AND CHAMBERLAIN, Morphology of angiosperms 80. 1903. 
- Fercuson, M. C., Two embryo sacs in Lilium longiflorum. Bot. GAZETTE 
43:418, 419. fig. 2. 1908. 
- Guicnarp, L., Recherches sur le sac embryonnaire des phanérogames angio- 
spermes. x Sci. Nat. Bot. VI. 13:136-199. pls. 3-7. 1882. 
to. Hotrerty, G. M., Ovule and embryo of Potamogeton natans. Bor. GAZETTE 
31:339-346. pls. 2, 3. 1901. 
11. JOHNsoN, D. S., A new type of a sac in Peperomia. Johns Hopkins 
University Cicatas 195:19-21. pis. 1907. 
12. Luoyn, , The So enbeao of Rubiaceae. Mem. Torr. 
Bot. Club 8: ea pls. 8-15 
13. NAWASCHIN, S. ne Beluditess bei den Orchideen. Ber. Deutsch. 
Bot. Gesells. si 224-2 1. 9. Igoo. 
14. Pace, L., Fevtilisation in Cypripedium. Bot. GAZETTE 44:353-374- Pls. 
24-27. 1907. 
15. SARGANT, E., The reconstruction of a race of primitive angiosperms. Annals 
of Botany 22:121-186. figs. 1-21. 1908. 
16. SCHNIEWIND-TurEs, J., Die Reduktion der Chromosomenzahl und die ihr 
folgenden Kernteilungen in den Embryosack-Mutterzellen der Angiospermen. 
Jena. 1901. 
17. Suir, R. W., A contribution to the life- eee of the Pontederiaceae. Bor. 
GAZETTE 25: 324-337. pls. 19, 20. 1808. 
- STRASBURGER, E., Einige Bemerkungen zur Frage nach der doppelten 
Befruchtung bei den Angiospermen. Bot. Zeit. 58:290-316. 1900. 
- Wrecanp, K. M. , The development of the embryo sac in some monocotyle- 
donous plants. Bos. GAZETTE 30:25-47. pls. 6, 7. 1900. 
EXPLANATION OF PLATES VII-IX 
All figures were drawn with a Bausch and Lomb camera. Fig. 8 was made 
with Leitz no, 4 ocular and no. 7 objective, and fig. 36 with no. 2 ocular and no. 7 
objective; all others with Leitz no. 4 ocular and Bausch and Lomb 7x objective. 
The abbreviations used are as follows: c chalazal daughter cell and nucleus; 
° €88; § generative nucleus; gc generative cell; m micropylar daughter nucleus; 
= Ragga nucleus; polar nucleus; s synergid; ¢ tube nucleus; 3 male 
nucleus 
an 
oN 
© 
al 
oO 
i 
© 
PLATE VII 
Fic. 1 -—Young ovule. 
Fic. 2 -—Young ovule with broader funiculus 
Fis. 3. —Archesporial cell differentiated; beginning of the integument. 
FIG. 4.—Mother cell; synapsis almost complete. 
