W] 



196 BOTANICAL GAZETTE [September 



• LITERATURE CITED 



CoKER, W. C, Notes on the gametoph; 

 Gazette 33:89-107. pis, j-8. 1902. 



Box. 



» 



2. Thompson, R. B., The megaspore membrane of the gjonnosperms. Univ. 



Toronto Studies, Biol. Series no. 4. 1905. 



3- , Preliminar}' note on the Araucarineae. Science N. S. 22:85. 1905. 



4. LopRiORE, G., Ueber die Vielkomigkeit der Pollenkomer von Araucaria 



Bidwillii Hook. Vorlaufige Mitteilung. Ber. Deutsch. Bot.. Gesells. 23: 



ZZS'ZA^' pi' -fi- ^9^5- 



5- JUEL 



Flora 93:56-62. 



pi. 3. 1904. 



6. Chamberlain, C. J., Review of Lopriore. Box. Gazexxe 40:391. 1905. 



7. Caldw^ell, Oxis W., Microcycas caJocoma, Box. Gazette. 44:118-141. 



pis, 10-13, 1907* 



EXPLANATION OF PLATE XIX 



A Zeiss apochromatic 2™^ 

 \n^ ocular 8 were used. All 



Abbreviations: L tube 



gnificat 



X 



ipermatogenous 



Figs, x~iOj Dacrydium BidwiUii 



Fig. I. Microspore. 



Fig. 2. First prothallial cell cut off. 



Figs. 3, 4. Cutting-off of second prothallial cell. 



Fig. 5. Cutting-ofF of generative cell. 



Fig. 6. The second prothallial cell divided. 



Fig. 7. Division of generative cell. 





enlargin 



Fig. 9. Tube nucleus, body cell, and two prothallial cells; stalk cell not 



shown. 



Fig. 10. Walls of stalk and body cells disappearing. 

 Fig. ii. Dacrydium cupressinum; both prothallial cells divided. 

 Figs. 12, 13. Dacrydium laxifolijim; tube nucleus entering the tube; body 

 cell and prothallial and stalk nuclei in the grain. 



I 



I 



