120 BOTANICAL GAZETTE 
LITERATURE CITED. 
1. Scuimper, A. F. W., Ueber Bau und Lebensweise der Epiphyten 
diens. Bot. Centralbl. 17: 192 et seq. 1884. 
, Botanische Mittheilungen aus den Tropen. 2. Die epiphyti 
tation Amerikas. pp. 162. pls. 6. Jena. 1888. 
4. Hormetster, W., Neue Beobachtungen iiber Embryobildung 
Togamen. Jahrb. Wiss. Bot. 1: 82-188. pls. 7-10. 1858. 
MEEHAN, T., The Florida moss, Tillandsia usneoides. Proc. Acad. 
Philadelphia 1875: 466. . 
ee by Aa OO Monographiae Phanerogamarum. Editore et pro parte be 
Casimiro de Candolle. IX. Bromeliaceae. Paris. 1896. a 
7- CAMPBELL, D. H., Studies on the flower and embryo of Sparganium. 
California Acad. Sci. III. Bot. r: 293-328. pls. 46-48. 1899. 
8. HABERLANDT, G., Zur Kenntniss des Spaltéffnungapparatus. 
97-110. pl. 2. 1887. 
9. Merz, Cart, Physiologische Bromeliaceen-Studien. I. Die Was 
mie der extrematmosphaerischen Tillandsien. Jahrb. Wiss. Bot 
229. 1904. 
- 
EXPLANATION OF PLATES VIII-XI. 
Fic. 2. Ovule fundament showing archesporial cell. a 
Fie. 3. Young ovule at period just before first division of archesporial ce 
Fic. 4. Spindle of first division. i 
Fics. 5-6. Stages in formation of axial row of potential megaspores. 
Fic. 7. Megaspores without separating walls. . 
Fics. 8-9. Enlargement of basal megaspore to form embryo sac ™ 
Fics. 10-14. Stages in formation of embryo sac. : 
Fic. 15. Pollen tube just after entering embryo sac. a 
Fic. 16. Fusion of polars before rupture of pollen tube: s, synergid 
Fic. 17. Lateral discharge of pollen tube: e, egg; ¢, tube nucleus; 
Fic. 18. Simultaneous double fertilization. a 
- Double fertilization with discharge of tube nucleus (#); & egs: 
Fic. 20. Fusion of male and endosperm nuclei. i 
Fic. 21. Ovule at time of completed embryo sac. 
Fic. 22. Elongation of ovule and outer integument after f : 
Fic. 23. First division in formation of chalazal endosperm tissue- 
Fic. 24. Chalazal endosperm tissue and portion of endosperm 
as reserve material in ripe seed. - 
Fics. 25-26. Two- and three-celled embryos. 
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