1 8 Weiss, Xenophyton radiculos2iui (Hick). 



PLATE XII. 



Xenophyton radiculosum (Hick). 



Fig. I. A longitudinal section cut slightly obliquely through the 

 stele, close to the origin of a rootlet-bundle (Cash 

 Collection, No. 154. x 25). [This section has 

 been inverted to facilitate the lettering.] 

 ;;/ = pith. 

 X = xylem. 

 ph = phloem. 

 i.e. = inner cortex. 

 m.c. - middle cortex. 

 rJ>. = rootlet-bundle. 



Fig. 2. A rootlet-bundle on its outward course through the 

 middle cortex (Cash Collection, No. 148. x 25). 

 pA. = phloem. 



.V = xylem. 

 m.c. = middle cortex. 

 fn.c.r. = middle cortex of rootlet formed by secondary 

 growth on the outside of rootlet-bundle. 



Fig. 3. A rootlet-bundle near the outside of the middle cortex, 

 surrounded by radiating strands of cells of middle 

 cortex. The inner cortex forms a sheath round 

 the xylem and phloem (Cash Collection, No. 

 148. X 40). 



Fig. 4. A rootlet-cushion with the adjoining outer cortex. At the 

 base are seen the xylem and phloem of the rootlet- 

 bundle cut nearly transversely (Cash Collection, 

 No. 149- X 15)- 



