1908] BROW N—PEPEROMIA 459 
LITERATURE CITED 
1. CAMPBELL, D. H., Die Entwicklung des Embryosackes von Peperomia 
pellucida Knuth. Ber. Deutsch. Bot. Gesells. 1'7:452-456. pl. 31. 1899. 
, A peculiar embryo sac in Peperomia pellucida. Annals of Botany 
13:626. 1899. : 
. 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. 
4. COULTER AND CHAMBERLAIN, Morphology of angiosperms 76-80, 84-86. 
ad 
w 
1903. 
5. Jonnson, D. S., On the endosperm and embryo of Peperomia pellucida. 
Bor. GAZETTE 30:1-11. pl. 1. 1900. 
, On the development of certain Piperaceae. Bot. GAZETTE 34:321- 
340. pls. 9, 10. 1902. 
. ——, A new type of embryo sac in Peperomia. Johns Hopkins Univer- 
sity Circular 195:19-21. pls. 5, 6. 1907. 
8. Lioyp, F. E., The comparative embryology of the Rubiaceae. Mem. Torr. 
Bot. Club 8:27-112. pls. 8-15. 1902. 
9. Pace, Luta, Fertilization in Cypripedium. Bot. GAZETTE 44:353-374 
pls. 24-27. 1908. 
10. Porscu, Orro, Versuch einer phylogenetischen Erklarung des Embryo- 
sackes und der doppelten Befruchtung der Angiospermen. 1907 
11. SuirH, R. W., A contribution to the life-history of the Pontederiaceae. 
Bor. GAZETTE 25: 324-337. pls. 19, 20. 1908. 
12. STRASBURGER, E., Die Samenlage von Drimys Winteri und die Endosperm- 
bildung bei Angiospermen. Flora 95:215-231. 1905- 
13. Wriecanp, K. M., The development of the embryo sac in some monocoty- 
ledonous plants. Bot. GAZETTE 30:25-47. pls. 6, 7. 1900. 
a 
EXPLANATION OF PLATES XXXI-XXXII 
All drawings were drawn’ with the aid of a camera lucida and reduced one- 
half. Figs. 1, 2, 4, 18-23, 31, 32 were made with a no. 8 ocular and a 2.6°= 
objective; figs. 3, 5-17 with a no. 12 ocular and a 1.5"™ objective; (figs. 24- 
27, 29, 30 with a no. 8 ocular and a 7x objective; jig. 28 with a no. 2 ocular and 
a } objective. 
Peperomia Sintensit 
Fic. 1.—Primary archesporial cell in apex of nucellus. 
Fic. 2,—Archesporial cell has divided to sporogenous and parietal cell; the 
latter dividing and showing sixteen chromosomes, integument beginning to 
grow up around nucellus. 
Fic. 3.—Longitudinal view of an anaphase in a vegetative cell. 
Fic. 4.—Nucellus containing embryo sac mother cell, which shows a stage 
shortly before synapsis; part of integument which now surrounds nucellus shown 
at base of nucellus. 
