6o MORPHOLOGY OF GYMNOSPERMS 



LITERATURE CITED 



1. Williamson, W. C., On the organization of the fossil plants of the Coal- 

 measures. IV. Didyoxylon, Lyginodendron, and Heterangium. Phil. 

 Trans. Roy. Soc. London B 163:377-408. ph. 22-31. 1873. 



10. Renault, B., Recherches sur la fructification de quelques vegetaux prove- 

 nant des gisements silicifles d'Autun et de Saint Etienne. Ann. Sci. Nat. 

 Bot. VI. 3:5-29. pis. 1-4. 1876. 



2. Williamson, W. C, On some fossil seeds from the Lower Carboniferous 

 beds of Lancashire. Rep. 45th Meeting British Assoc. (1875): 159-160. 

 1876. 



3. , On the organization, etc. VIII. Ferns (continued) and gj-mno- 



spermous stems and seeds. Ann. Mag. Nat. Hist. 18:268-273. 1876 (pre- 

 liminary notice); Proc. Roy. Soc. London 25:68-73. 1877 (abstract); 

 Phil. Trans. Roy. Soc. London B 167:213-270. pis. j-i6. 1878 (full paper). 



4. , On the organization, etc. X. Phil. Trans. Roy. Soc. London B 



171 ••493-539- pis. 14-21. 1880. 



5. , On the organization, etc. XIII. Phil. Trans. Roy. Soc. London 



B 178:289-304. pis. 21-24. 1887 (p. 299). 



6. Brongniart, a., Recherches sur les graines fossiles silicifies. Paris. 1881. 



7. Stur, D., Zur Morphologic und Systematik der Kulm- und Karbonfame. 

 Sitzungsb. Akad. Wiss. Wien 88: pp. 214. f.gs. 4. 1883. 



8. Williamson, W. C, On the organization, etc. XII. Phil. Trans. Roy. 

 Soc. London B 174:459-475. pis. 27-34. 1883. 



9. Renault, B., Cours de botanique fossile. Paris. 1880-1884. 



10. Van Tieghem, Ph., et Douliot, H., Sur la polysteHe. Ann. Sci. Nat. Bot. 

 VII. 3:275-322. pis. 13, 14. 1886. 



11. KiDSTON, R., On the fructifications of some ferns from the Carboniferous 

 formation. Trans. Roy. Soc. Edinburgh 33'= 137-156- pis. S. figs. 7. 1887. 



12. Renault, B., Note sur le genre Aetheotesta. Mem. Soc. Hist. Nat. Saonc- 

 et-Loire, pp. 156, 158. 1887. 



13. Sablon, Leclerc du, Recherches sur la tige des fougeres. Ann. Sci. Nat. 

 Bot. VII. 11:1-16. pis. J, 2. 1890. 



14. Williamson, W. C, On the organization, etc. XVII. Phil. Trans. Roy. 

 Soc. London B 181:89-106. pis. 12-15. 1890. 



15. Kidston, R., On the various divisions of British Carboniferous rocks, as 

 determined by their fossil floras. Proc. Roy. Soc. Edinburgh 12:183-257. 

 1893-1894. 



16. REN.4ULT, B., Bassin houiller et Permien d'Autun et d'Epinac. IV. Flore 

 fossile. Part II. pp. 578. pis. 62. Paris. 1896. 



17. Weber, O., und Sterzel, J. T., Beitrage zur Kenntnis der MeduUoseae. 

 XIII. Ber. Naturwiss. Gesell. Chemnitz, pp. 102. pis. g. figs. 33. 1896. 



18. Williamson, W. C, and Scott, D. H., Further obser\'ations on the organiza- 

 tion of the fossil plants from the Coal-measures. III. Lyginodendron and 



