iS) 
w 
BOTANICAL GAZETTE [OCTOBER 
LITERATURE CITED 
. Encier, A., Thismia Winkleri Engl., eine neue afrikanische Burmannia- 
ceae. Bot. Tab: 38:89-01. fig. I 
1907. 
. Ernst, A., Apogamie bei Raapusie coelestis Don. Ber. Deutsch. Bot. 
Gesells. 27:157-168. pl. 7. 1909. 
. Ernst, A., and BERNARD, CHARLES, Beitriige zur Kenntniss der Saprophy- 
ten Javas. III. Embryologie von Thismia javanica J.J.Sm. Ann. Jard. 
Bot. Buitenzorg 8:48-61. pls. 14-17. 1909. 
, VI. Beitriige zur Embryologie von Thismia clandestina Mig. und 
a: Veseiesit ¥. J. Sm. bid. 9:71-78. pls. 12, 13. 1911 
I7. 1912 
6. 
“J 
, [X. Entwicklungsgeschichte des Porbiownackes und des Embryos 
von B. candida Engl. und B. Championii Thw. Ibid. 10:161-188. pls. 13- 
_XIL. Entwicklungsgeschichte des Embryosackes, des Embryos, 
und pees Endosperms von B. coelestis Don. Ibid. 11:234-257. pls. 19-22. 
12. 
19 
. JoHow, Fr., Die chlorophyllfreien tia hence Westindiens. Jahrb. 
Wiss. Bot. 5: 415-449. pls. 16-18. 1885. 
, Die chlorophyllfreien Humusbewohner. Jahrb. Wiss. Bot. 20: 
Ves: pls. 19-22. 1880. 
. Mrers, Joun, On a new genus of plants of the family Burmanniaceae. 
Trans. Linn. Soc. 20:373-382. pl. 15. 1851. 
PretrFeR, Norma E., Morphology of Thismia americana. Bot. GAZ. 57: 
122-135. pls. 7-II. 1914. 
. SCHLECHTER, R., Burmanniaceae Africanae. Bot. Jahrb. 38:137-143- 
1907. 
. SHarp, Lester W., The orchid embryo sac. Bot. Gaz. 54:372-385- 
pls. 21-23. 1912. 
. TrEvB, M., Notes sur l’embryon, le sac embryonnaire et l’ovule. Ann. 
Jard. Bot. Buitenzorg 3:120-128. pls. 18-19. 1 
EXPLANATION OF PLATE XVI 
res were drawn with the aid of the camera lucida, and show mag- — 
A 
nifications as follows: figs. 1, 3, 5, 10, X840; 13, 14, 15, 16, X500; 17, X 260; 
2, 7, 8, 9, 11, X916; 4, 6, X784; 12, X1651. 
F 
G. 1.—Primordium of ovule. 
Fic. 2.—Synapsis in megaspore mother cell. 
Fic. 3.—Daughter cells of megaspore mother cell. 
Fic. 4.—Four megaspores. 
Fic. 5.—Four megaspores, two outer cells already disorganized. 
Fic. 6.—Same stage, but sister cell to functional megaspore crushed. 
Fics. 7-9.—Binucleate embryo sacs. 
