

I4 6 BOTANICAL GAZETTE [February 



J 



J 



Charles J 



well for material. 



The University of Chicago 



LITERATURE CITED 



i. Caldwell, O. W., and Baker, C. F., The identity of Microcycas calocoma. 

 Bot. Gazette 43:330. 1907. 



2. Caldwell, O. W., Microcycas calocoma. Bot. Gazette 44:118. 1907. 



3. Chamberlain, C J., Preliminary note on Ceratozamia. Bot. Gazette 



43:137- i9°7 



4 



. Chrysler, ML A., The development of the central cylinder in Araceae and 



W ft * # — fc- _*■»!_* J— h 



Liliaceae. Bot. Gazette 38:161. 1904. 



5. Coulter, J. M., and Chamberlain, C. J., Morphology of angiosperms 



206. 1903. 



6. DeCandolle, A., Microcycas calocoma. DC. Prodr. 16:558. 1 



868. 



7. DORETY 

 I908. 



DeFraine. E.. On the seedling structure of gymnosperms 



9. Juel, H. O. 

 10. Land, W. J 



906 



1904 

 Box. 



44:273. 1907 



-ligneux des Cvcadacees. Caen. 1904 



Bot 



12. Thiessen, R., The vascular anatomy of the seedling of Dioon edule. 



Gazette 46:357. 1908. 

 Worsdell, W. C, Comp 

 Soc. Lond. 33:437. 1898. 



Jour. Linn. 



The drawings were made with the aid of an Abbe camera lucida. The following 

 abbreviations have been employed: A, B, C, D, main cotyledonary traces; *. 



rriHrlo^^nn— ~1 .1 f ..... . . » -.v rnrtCXi 



epidermis 



cortex 

 duct; 



«*, metaxylem ; #*, phloem; /w, protoxylem; r/ramentum; /, tannin cells. 



PLATE V 



their 



Fig. i.— Transverse section near the middle of the cotyledons, showing 



complete fusion and the large number of cotyledonary strands. X 8. ^ 



Fig. 2.— Transverse section of cotyledons o . 6 mm above the tip of P lu0lU ' 

 X8. 



Fig. 3.— Diagram of stele 40 m above the cotyledonary node. 



