334 BOTANICAL GAZETTE 
Fic. 16. Diagram of cross and longitudinal sections th 0 
late base of the lamina; a, outer cortex and chlorenchyma; 4, pz 
tous tissue; c, sclerenchymatous layer around the pith ; d, pith. 
G. 17. Detail of cross section through same area as last 
cal chlorenchymatous, and parenchymatous tissue. 
_ Fie. 18. Cross section sane area as last and oe t 
out from the central pith. 
Fig. 19. Longitudinal section through the region of be 
_ Fic. 20. Longitudinal section through the region of fig. 18 
1G. 21. Cross section of lamina through the wing.” 
Fig.-22.. Section through a sorus showing sporangia with 
