i8o 
WALTER P. THOMPSON 
15. Literature 
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Bot. 38: 29-80. 1907. 
2. Studies in the Evolution of Angiosperms. The Relationship of Angio- 
sperms to the Gnetales. Annals of Botany 22: 489-515. 1908. 
3. Beccari, O. Delia organogenia dei fiori-feminei del Gnetum Gnemon. Nuov. 
Giorn. Bot. Ital. 9: 91. 1877. 
4. Berridge and Sanday. The Embryology of Ephedra, New Phytologist, 1907. 
5. Bower, G. The Germination and Embryogeny of Gnetum gnemon. Quart. 
Journ. Micr. Sci. 22: 278-298. 1882. 
6. Campbell, D. H. A Peculiar Embryo-sac in Peperomia pellucida. Annals of 
Botany 13: 626. 1899. 
7. Coulter, J, M. The Embryo-sac and Embryo of Gnetum. Bot. Gaz. 46: 43-49. 
1908. 
8. Coulter, J. M. and Chamberlain, C. J. Morphology of Angiosperms. New 
York, Appleton. 1903. 
9. Morphology of Gymnosperms. University of Chicago Press, 1910. 
10. Johnson, D. S. On the Development of Certain Piperaceae. Bot. Gaz. 34: 
321-338. 1902. 
11. Studies of the Development of the Piperaceae. II. The Structure and 
Seed Development of Peperomia hispidula. Amer Journ. Bot. i: 323-339. 
1914 and i: 357-397- I9i4- 
12. Karsten, G. Beitrag zur Entwickelungsgeschichte einiger Gnetum — Arten. 
Bot. Zeit. 50: 205-219. 1892 and 50: 221-231. 1892 and 50: 237-243. 
1892. 
13. Zur Entwickelungsgeschichte der Gattung Gnetum. Beitr. Biol. Pflanz. 
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15. Land, W. J. G. Spermatogenesis and Oogenesis in Ephedra trifurca. Bot. Gaz. 
38: 1-18. 1904. 
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17. Lignier, O. and Tison, A. Les Gnetales leur Fleurs et leur Position Systematique. 
Ann. Sci. Nat. IX. Bot, 16: 55-185. 1912. 
18. L'Ovule tritegumente des Gnetum est probablement un axe d'inflores- 
cence. Bull. Soc. Bot. France 13: 1913. 
19. Lotsy, J. P. Contributions to the Life History of the Genus Gnetum. Ann. 
Jard. Bot. Buitenzorg 16: 46-114. 1899. 
20. Parthenogenesis bei Gnetum ula. Flora 92: 397-404. 1903. 
21. Pearson, H. H. W. Further Observations on Welwitschia. Phil. Trans. 
Lond. 1908. 
22. On the Microsporangium and Microspore of Gnetum. Annals of Botany 
26: 603-620. 1912. 
23. Schnegg, H. ^Beitrage zur Kenntniss der Gattung Gunnera. Flora 90: 161- 
208. 1902. 
