G. R. Wieland — American Fossil Cycads. 391 



Plate X. 



Figure 13. — Gycadeoidea Wielandi, Ward 9; transverse section of an inter- 

 seminal scale, x 185. 



a, xylem zone of a bordering seed stem ; b, epidermis of the 

 interseminal scale ; c, xylem ; d, parenchyma ; e, heavy and much 

 broken subepidermal layer. 



Note. — Where two scales border there is a double layer of b. 



Figure 14. — Gycadeoidea Wielandi, Ward ? ; type specimen ; transverse sec- 

 tion through seed stem and surrounding interseminal scales, no 

 parenchyma of either of these organs being preserved, x 22. 



Figtre 15. — Same fruit as figure 13 ; transverse section through the central 

 bundle of a seed stem, x 185. 



a, xylem zone; b, endodermis; c, parenchyma; d, xylem; e, cel- 

 lular interspace. 



Figure 16. — Same fruit as preceding; transverse section of seed stems and 

 interseminal scales, all elements being preserved, x 22. 



Figure 17. — Gycadeoidea (sp.) $ ; transverse section through the pendent sori 

 of a sporophyll. x 18. 



a, epidermis of prismatic cells which entirely invests each sorus, 

 the latter consisting of two parallel rows of sporangia ; b, one of 

 the sporangia containing pollen grains as illustrated in text, figures 

 7-14, page 389. 



Figure 18. — Same as preceding, but showing a larger area. The arrow points 

 towards the floral axis, x 3. 



