298 BOTANICAL GAZETTE [april 



LITERATURE CITED 



i. Strasburger, Ed., tjber das Verhalten des Pollens und die Begrucht- 

 ungsvorange bei den Gymnospermen. 1892. 



2. Miyake, K., On the development of the sexual organs and fertilization in 

 Picea excelsa. Ann. Botany 17:351-372. 1903. 



3. Pollock, James B., Variations in the pollen grain of Picea excelsa. 

 Amer. Nat. 49:253-286. 1906. 



4. Juranyi, L., Bau und Entwickelung des Pollens bei Ceratozamia longi- 

 folia. Jahrb. Wiss. Bot. 8:832-400. 1872. 



5. Tschistiakoff, Beitrage zur Physiologie der Pflanzenzelle. Der rollen 

 der Coniferen. Bot. Zeit. 33:86-88, 97-103- 1875. 



6. Belajeff, W., Zur Lehre von dem Pollenschlauche der Gymnospermen. 

 Ber. Deutsch. Bot. Gesells. 91:280-286. 1891. 



7a. Lawson, A. A., The phase of the nucleus known as synapsis. Trans. 



Roy. Soc. Edinb. 47:591-604. 1912. 

 7 b. , Nuclear osmosis as a factor in mitosis. Trans. Roy. Soc. Edinb. 



48:137-161. 1913. 



8. Sharp, L. W., Somatic chromosomes in Vicia. La Cellule 29:297-328. 



1913- 



9. Hutchinson, A. H., The male gametophyte of Abies balsamea. Box. 



Gaz. 57:148-153. 1914. 



10. Chamberlain, C. J., The pollen grain of Lilium philadclphiatm. Bot. 

 Gaz. 33:423-430. 1897. 



11. Schaffner, J. H., The development of stamens and carpels of Typha 

 lull [folia. Bot. Gaz. 24:93-102. 1897. 



12. Guignard, L., Recherches sur la developpment de l'anthere et du pollen 

 des Orchidees. Ann. Sci. Nat. Bot. VI. 14:26-45. 18S2. 



13. Pace, Lulu, The gametophytes of Calopogon. Bot. Gaz. 48:126-137. 

 pis. 7-9. 1909. 



13a. Coker, W. C, On the spores of certain Coniferae. Bot. Gaz. 38:206- 



213. 1904. 

 13b. Coker, W. C, Notes on the gametophytes and embryo of Podocarpus. 



Bot. Gaz. 33:89-107. 1900. 



14. Jeffrey, E. C, and Chrysler, M. A., The microgametophyte of the 

 Podocarpineae. Amer. Nat. 41:102-107. 1907. 



15. Ferguson, Margaret C, Contributions to the life history of Pinus. 

 Proc. Wash. Acad. Sci. 6:1-202. 1904. 



16a. Young, Mary S., The male gametophyte of Dacrydium. Bot. Gaz. 



44:189-196. 1907. 

 x 6b , The morphology of the Podocarpineae. Bot. Gaz. 50:81-100. 



1910. 

 17. Caldwell, Otis W., Microcycas calocoma. Bot. Gaz. 44:118-141. 1907. 



