THE MICROSPORANGIUM 45 



28. Merrell. W. D. A Contribution to the Life History of Silphium. 



Bot. Gazette 29 : 99-133. pis. 3-10. 1900. 



29. Conrad, A. H. A Contribution to the Life History of Quercus. 



Bot. Gazette 29 : 408-418. pis. 28-29. 1900. 



30. Lotsy, J. P. Rhopalocnemis phalloides Jungh.. a Morphological- 



systematical Study. Ann. Jard. Bot. Buitenzoi-g II. 2 : 73-101. 

 pis. 3-1J,. 1900. 



31. Strasburger. E. Einige Bemerkungen zu der Pollenbildung bei 



Asclepias. Ber. Deutsch. Bot. Gesell. 19 : 450-461. pi. 24. 1901. 



32. Rosenberg, O. Ueber die Pollenbildung von Zostera. Meddel. 



Stockholms Hogsk. Bot. Inst. pp. 21. 1901. 



33. Frye, T. C. Development of the Pollen in some Asclepiadaceae. 



Bot. Gazette 32: 325-331. pi. IS. 1901. 



34. Webb. J. E. A Morphological Study of the Flower and Embryo 



of Spiraea. Bot. Gazette 33: 451-460. figs. 28. 1902. For 

 correction of names see Rehder in Bot. Gazette 34: 246. 1902. 



35. Shoemaker. D. N. Notes on the Development of Hamamelis 



virginiana L. Johns Hopkins Univ. Circ. 21 : 86-87. 1902. 



