CANNABIS SATIVA 



2-43 



Epidermal hairs are produced on both surfaces, being more 

 numerous on the lower, and the large persistent hairs produce 

 basal cystoliths. Glandular hairs also occur in large numbers, 

 these being especially noticeable in the young leaf and less so in 

 the mature blade, since they tend to break off with age. 



The mesophyll, except adjacent to the principal veins, consists 

 of a single layer of slender, elongated palisade cells which occupy 



Fig. ii6. Transection of a portion of mature leaf through midvein : ca, cambium; cy, 

 cystolith ; e^, epidermis; gl hr, glandular hair; hr, hair; mech, mechanical tissue; fal, 

 palisade; ph, phloem; spo, sponge cells; sto, stoma; xy i, primary xylem; xy x, secondary 

 xylem. The dark spots in phloem indicate location of latex ducts. 



slightly more than half the thickness of the leaf. The spongy 

 parenchyma is very loosely organized, and there are large inter- 

 cellular spaces leading to the substomatal cavities. The midvein 

 of the leaflet is reinforced by a group of mechanical cells which are 

 located below the groove on the adaxial surface. There is also a 

 zone of mechanical tissue three to four, cells in width immediately 

 inside the abaxial epidermis. The vascular bundle is collateral, 

 resembling that described for the stem; and, in the midvein, there 



