318 BOTANICAL GAZETTE [OCTOBER 
Fic. 16.—Cross-section of a subterranean internode of a mature specimen: 
S, stereomatic pericycle; Camb, cambium; other letters as above; 44. 
G. 17.—Cross-section of lateral part of leaf blade: Ep, ventral epidermis; 
Ept, dona epidermis; P, palisade tissue; P+, pneumatic tissue; 600. 
G. 18.—Pneumatic tissue of leaf, superficial section; 60. 
ae 19.—Cross-section of part of midrib of leaf: S, stereome; L, leptome; 
H, hadrome; 600 


