PLATE X. 



Fig. 21. — Transverse section of the bark of Fig. 18, PI. IX. Outer paren- 

 chyma, d. Prosenchymatous zone, d'. X 18. Cabinet, No. 775. (Pages 18, 19.) 



Fig. 42. — Transverse section of a large Stigmarian rootlet, g, into the interior 

 of which several other younger rootlets have penetrated. Vascular bundle of the 

 large rootlet,/. Cortex of one of the smaller rootlets, #". Its inner vacant cavity, 

 g . Its vascular bundle and sheath, /'. X 11. Cabinet, No. 848. (Pages 

 13, 25, 26, 33.) 



Fig. 43. — Longitudinal section of the proximal end of a rootlet. Parenchy- 

 matous cortex of the root, d, d. Prosenchymatous cortex of the root, e. Vascular 

 rootlet bundle, /,/. Rootlet bundle- sheath,/'. Branching cells investing the 

 extremity of the rootlet cushion, i, i. Outer cortex of the rootlet, g, g. Fistular 

 interior of the rootlet, g' . X 18. (Pages 26, 27, 28.) 



Fig. 44. — Longitudinal section of the proximal end of another rootlet. Pro- 

 senchymatous zone of the root-bark, d! . Central portion of the rootlet cushion, 

 h, h. Conical extremity of the rootlet cushion inside the rootlet, h'. Rootlet 

 bundle,/. Rootlet bundle-sheath,/'. Outer cortex of the rootlet,^. Fistular 

 interior of the rootlet, g. X 18. Cabinet, No. 819. (Pages 26, 27, 28, 39.) 



Fig. 50. — Minute branching tubular cells investing the surface of the conical 

 extremity, h', of the rootlet cushion, seen in the longitudinal rootlet sections, 

 e. g. fig. 43, i, PL X. (Page 27.) 



