234 



BOTANICAL GAZETTE 



[march 



r 



• 



peculiar appearance on account of the granules and globules which 



adhere to them. 



becomes 



breaks up into granules from which the spiral band is formed. 



it. The 



turns 



so large as those of Zamia. 



Microcycas 



The sperms are formed within sperm mother cells, from which they 

 are discharged. The same is true of Zamia, Ceratozamia, and 

 probably of other cycads. 



In addition to the movement by cilia, there is a vigorous amoeboid 

 movement of both nucleus and cytoplasm. 



in progress have been completed. 



The University of Chicago 



erved 



LITERATURE CITED 



i. Ikeno 



ne 



und die Vorgang der Befruchtung bei Cycas revoluta. Jahrb. Wiss 



557-6 



2. 



J-, Sperm; 



U. S. Dept. 



3 



Agnc. Bureau PI. Ind. Bull. No. 2. pp. i-ioo. pis. 1-7. 1901. 



JUEL, H. O., TJeber den Pollenschlanrli vnn Timrpssus. Flora Q3o^ 2 



pis. 3. 1904. 



of Pinus. 



Margaret 



6. 



C, Contributions to the knowledge of the life history 

 Wash. Acad. Sci. 6: 1-202. pis. 1-24. 1904. 

 Miyake, K., Ueber die Spermatozoiden von C«au revoluta, Ber. Deutsch. 

 Bot. Gesells. 24:78-83. pi. 6. 1906. 



-, The spermatozoid of Ginkgo. I 

 1906. 6 J 



Chamberlain, C. J. 



5:n 



73-1780. 



Box. 



8. 



9 



11. 



Gazette 42:321-358. pis. zj, r 4 . IO o6. 



Smith, Frances Grace, Morphology ol ™ 



microsporangiurn of cycads. Bot. Gazette 43:187-204. ph- *°- I ^ 7 ' 



Caldwell, O. W., Microcycas calocoma. Bot. Gazette 44= "8" 1 

 pis. io-ij. I0o7> 



Land, W. J. G., Fertilization ar 



Gazette 44:273-292. pis. 20-22 



YAMANOUcm, S., Spermatocele 

 chum. 



of the 



mbryogeny of Ephedra trijurca. 



Bot. 



in 



Xephro- 



Bot. Gazette 45:145-! 7S . p^ 6- 8 . 1908. 

 i^ORETY, Sister Helen Angela, The seedling 

 Gazette 46:205-220. pis. I2 - l6 . I9 o8. 



Bot 



