1960] 



ANATOMY OF GUAYAXA XYRIDACEAE 



83 



Fig. 39. Achlyphila disUcha, portion of sagittal section of upper leaf, showing sclereicls 

 which comprise the epidermis. X 200. Fig. 40. Abolboda sprucei, enlarged portion of a 

 section also shown in figure 41; at left, a tracheid with very wide annular thickenings; in 

 center, a parenchyma cell; at right, out of focus, wide band from a helically-thickened 

 tracheid. X 915. Fig. 41. The same, showing a larger area of a sagittal section of the 

 thorn like tip of a leaf. Portions of tracheids (with very thin intervening walls) are shown, 

 right, and left, and in the center (dark) parenchyma cells. The tracheids, left, have annular 

 bands; those at right shown annular bands above and helical bands below. X 523. Fig. 42. 

 A. macrostachya var. macrostachya, transection of thorn-like leaf tip, showing wide-helix and 

 wide-annular band tracheids interspersed among parenchyma cells. X 285. Fig. 43. 

 Orectanthe ptaritepuiana, portion of parasagittal leaf section, showing abaxial epidermis 

 (above) and about three layers of arm-palisade cells. X 238. • 



