Ree? Sey ea eee Ree era ee hh eS, 
1909] MCALLISTER—EMBRYO SAC OF SMILACINA 213 
6. In Smilacina racemosa the outer daughter cell of the hetero- 
typic division develops into the embryo sac, although the long per- 
sistence of the two nuclei formed by the division of the inner hetero- 
typic nucleus might suggest that they should be considered a part of 
the embryo sac. Smilacina racemosa shows temporary cell division 
at the close of the homeotypic division, agreeing in this respect with 
Smilacina stellata. 
I wish to express my obligations to Professor H. D. DENSMoRE, in 
whose laboratory at Beloit College this investigation has been largely 
carried on. I am also indebted to Professor R. A. HarPEr for his sug- 
gestions and criticisms during the preparation of the manuscript. 
LITERATURE CITED 
I. Brown, W. H., The nature of the embryo sac of Peperomia. Bot. GAZETTE 
46: 445-460. pls. 31-33. 1908. 
2. Campsett, D. H., A peculiar embryo sac in Peperomia pellucida. Annals of 
Botany 13:626. 1899. 
3: ———, Die Entwicklung des Embryosackes von Peperomia pellucida Knuth. 
Ber. Deutsch. Bot. Gesells. 1'7: 452-456. pl. 31. 1899. 
‘ —— The embryo sac of Pandanus. Annals of Botany 22:330. 1908. 
» 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. 
6. CHAMBERLAIN, C. J., Winter characteristics of certain sporangia. Bor. 
GAZETTE 25:124-128. pl. rr. 1898. 
Cxopar, R., eT BERNARD, C., Sur le sac embryonnaire de l’Helosis guaya- 
nensis, 
ap 
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Q 
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Befruchtung bei Paris quadrifolia und Trillium grandiflorum. Flora 91:1- 
46. pls. 1-6. 1902. 
= aa, Zur Phylogenie des Embryosackes der Angiospermen. Ber. Deutsch 
ot. Gesells. 26a: 419-437. pl. 7. 1908. 
™ Guicnazn, L., Stracture et division du noyau cellulaire. Ann. Sci. Nat. 
~~» Nouvelles études sur la fécondation. Ann. Sci. Nat. Bot. VII. 14: 
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» Jonson, D. S., On the endosperm and embryo of Peperomia pellucida. 
OT. GazETTE 30: 1-11. pl. 1. 1900. 
