300 BOTANICAL GAZETTE [October 



An increase in the number of antipodals by division'of the original 

 three has been reported in a number of families, but, so far as I can 

 discover, an endosperm tissue of the origin and character here de- 

 scribed for the Pontederiaceae has not been before described. Its 

 closest approach is probably to be found in Tillandsia. 



Chapel Hill, N. C, 



LITERATURE CITED 



1. Billings, T, H., A study of Tillandsia usneoides. Box. Gazette 38:99-121. 

 ph. 8~ij, 1904. 



2. Campbell, D. H., Notes on the structure of the embryo sac in Sparganium 

 and Lysichiton. Box. Gazette 27:153-166. pL i. 1899. 



3. , A morphological study of Naias and Zannichellia. Proc. Calif. 



Acad. Sci. III. 1:1-62. ph. i~§. 1897. 



4. Chamberlain, C. J., The embryo sac of Aster novae-angliae. Bot. Gazette 

 20:205-212. ph. ij, 16. 1895. 



5. Cook, M. T., Development of the embr}^o sac and embryo of Castalia 

 odorata and Nymphaea advetia. Bull. Ton. Bot. Club 29:211-220. ph. 12, 

 I J. 1902. 



6. , The embr)'ogeny of some Cuban Nymphaeaceae. Bot. Gazette 



42:376-392. ph, i6~i8. 1906. 



7. Guignard, L., Recherches sur le sac embryonaire des Phanerogames Angio- 

 spermes. Ann. ScL Nat. Bot. VI- 13:136-199. ph. 3-7. 1882. 



8. Hall, J. G., An embryological study of Limnocharh emarginata. Bot. 

 Gazette 33:214-219. ^/. p. 1902. 



9. Hofmeister, W., Neuere Beobachtungen uber Embryobildung der Phan- 



r 



erogamen. Jahrb. Wiss. Bot. 1:82-188. ph. j-io. 1858. 



10. HoLFERTY, G. M., 0\nile and embryo of Potamogeton natans. Bot. Gazette 

 31:339-346. ph. 2, 3. 1901. 



11. Johnsop^, D. S., On the development of Saururus cernuus L. Bull. Ton. 

 Bot. Club 27:365-372. pL 23. 1900. 



12. MuRBECK, Ueber die Embryologie von Ruppia rostellata Koch. Handl. 

 Svensk. Vetensk. Akad. 36: pp. 21. ph. 3. 1902. 



13. SCHAFFNER, J. H., Contribution to the life-history of Sagittaria variabilis. 

 Bot. Gazette 23:252-273. ph, 20-26, 1897. 



14. Smith, W. R., A contribution to the life-history of the Pontederiaceae. 

 Bot. Gazette 23:324-337. ph. ig, 20. 1898. 



15. W\xiE, R. B., a morphological study of Elodea canadensis.' BoT. Gazette 

 37:1-22. ph. 1-4. 1904. 



16. Wiegand, K. M., Notes on the embr)-ology of Potamogeton. Bot. Gazette 

 25:116, 117. 1898. 



17* •> The development of the embryo sac in some monocotyledonous 



plants. Box. Gazette 30:25-27. ph. 6, 7. 1900. 



