PLATE LXV. 



Fig. 1. Multicellular clothing hair of the epidermis of a very young 

 leaf, x 110. 



Fig. 2. Cross section of the midrib of a very young leaf: m, clothing 

 hair; a, glandular hair; y, epidermis; n, parenchyma; r, cells which will 

 develop into bast fibers; o, phloem; x, tracheal tubes, x 110. 



Fig. 3. Cross section of the midrib of a somewhat older leaf: y, epi- 

 dermis; n, parenchyma; r, cells which will develop into bast fibers; 

 o, phloem; x, xylem. X 110. 



Fig. 4. Cross section of the midrib of a mature leaf: y, epidermis; 

 n, parenchyma; r, bast fibers; o, phloem; x, xylem. X 110. 



