Staber : . The anatomy of Sesban macrocarpa 633 



trouble and work in the sprouting and growing of the seedlings 

 for examination. 



■ 



Botanical Laboratory, Barnard College, 

 Columbia University, New York City. 



E:xplaiiatlon of plate 34- 



FiG. I. Transverse section of stem near tip, showing separate bundles ; X 8. 



Fig. 2. Detail of fig. i. d^ ducts ; /, tannin ; X 39- 



Fig. 3. Transverse section of stem at 21 cm. from base, showing complete woody 

 cylinder of 39 bundles; r, cambium; epi^ epidermis; lept^ leptome ; /, pith; j/, 

 stereome ; t, tannin ; X S- 



Fig. 4. Transverse section of stem at 40.2 cm,, showing the aerenchyma ; Qe7\ air 

 space ; col^ coUenchyma of 4 layers; ejid^ endodermal sheath bordering -r/, stereome ; 

 /, tannin duct in leptome tissue ; X 55- 



Fig. 5, Longitudinal section of leptome with lateral sieve-plate, /. j. /. ; c. w,, 

 cell wall ; X 318. 



Fig. 6. Transverse section at 18 cm., showing cambium, c ; med^ medullary ray 

 cells; /. c*, libriform cells; s. /, sieve plates; /, tannin cell; r. r, companion cell; 

 c, w, cambiform cell ; X 3^^. 



Fig, 7. Transverse section at 18 cm., showing twin sieve-plates s^ p; c. Cj com- 

 panion cells; c^ cambium; X3'S- 



Fig. 8. Transverse section at 16.7 cm., showing width of stereome walls; X3^8- 



Fig. Transverse section of root; r. d^ central duct; d^ duct; med^ medullary ray 

 cells; s, f^ stereome fiber, outer wall lignified, black portion known as third membrane 

 is of cellulose; X3J8, 



Fig. 10, Transverse section of leaflet near tip of the plant ; epi^ epidermis ; pat, 

 par^ palisade tissue; sp, par^ spongy parenchyma; t^ tannin; had^ hadrome ; lep^ 

 leptome; X 3^8- 



