90 MORPHOLOGY OF GYMNOSPERMS 



15. WoRSDELL, W. C, The aflinities of the mesozoic fossil Bennettites Gibsoni- 

 anus. Annals of Botany 14:717-721. 1900. 



16. WiELAND, G. R., A study of some American fossil cycads. IV. On the 

 microsporangiate fructification of Cycadeoidea. Amer. Jour. Sci. IV. 

 11:423-436. 1901. 



17. Nathorst, a. G., Beitrage zur Kenntnis einiger mesozoischen Cycado- 

 phyten. Handl. Kgl. Svensk. Vetensk.-Akad. 36*: pp. 28. pis. j. 1902. 



■18. LiGNiER, O., Le fruit du Williamsonia gigas Carr. et les Bennettitales, docu- 

 ments nouveaux et notes critiques. Mdm. Soc. Linn. Normandie 21 : 19-56. 

 figs. p. 1903. 



19. , Notes compldmentaires sur la structure du Bennettites Morieri. 



Bull. Soc. Lmn. Normandie V. 8:3-7. figs. j. 1905. 



20. WiELAND, G. R., The proembryo of the Bennettiteae. Amer. Jour. Sci. 

 IV. 18:445-447. pi. 20. 1904. 



21. Oliver, F. W., Pteridosperms and angiosperms. New Phytologist 5:232- 

 242. 1906. 



22. WiELAND, G. R., American fossil cycads. Publ. No. 34, Carnegie Institution 

 of Washington, pp. 296. pis. so. figs. 138. 1906. 



23. WoRSDELL, "W C, The structure and origin of the Cycadaceae. Annals 

 of Botany 20:129-159. figs. 17. 1906. 



24. Arber, E. a. NewelLj and Parkin, John, On the origin of angiosperms. 

 Jour. Linn. Soc. London Bot. 38:29-80. 1907. 



25. LiGNiER, O , Le fruit des Bennettitdes et I'ascendance des Angiospermes. 

 Bull. Soc. Bot. France IV. 8:1-17. 1908. 



•6, WiELAND, G. R., Historic fossil cycads. Amer. Jour. Sci. IV. 25:93-101. 

 1908. 



27. Coulter, John M., Evolutionary tendencies among gymnosperms. Bot. 

 Gazette 48 : 8 1-9 7 . 1 909. 



28. Scott, D. H., The paleontological record. II. Plants. Darwin and 

 modem science, pp. 200-222. Cambridge University Press. 1909. 



29. — , Studies in fossil botany. Second edition. Vol. II. London. 1909. 



30. WiELAND, G. R., The Williamsonias of the "Mixteca Alta." Bot. Gazette 

 48:427-441. figs. 10. 1909. 



31. Nathorst, A. G., Palaeobotanische Mitteilimgen. VIII. Handl. Kgl. 

 Svensk. Vetensk.-Akad. 45: no 4. 1910. 



