PLATE VIII. 



D. 8. ESPARTO Macrochloa (Stipa) tenarissima. x 150. 



Transverse section of central ribs, &c. 



General features of preceding section in greater detail, and show- 

 ing more clearly the band or bridge of lignified tissue passing 

 from lower epidermis between the chlorophyll areas and sur- 

 rounding the large fibro- vascular bundle. 



