LYCOPERSICUM ESCULENTUM 



577 



widths. In older petioles, some of the bundles may become inter- 

 connected by the development of an interfascicular cambium. 



Fig. 301. A, transection of portion of leaflet including midvein; B, diagrammatic tran- 

 section of petiole of leaf; C, portion of upper epidermis showing distribution of stomata ; 

 D, same of lower epidermis. In B, zone of mechanical tissue inside chljrenchyma is lined, 

 outer and inner phloem are stippled, xylem is black, and developing interfascicular cambium 

 is indicated by dots : ab ph, abaxial phloem ; ad ph, adaxial phloem ; col, collenchyma ; 

 sto, stoma. 



(Fig. 301, B.) The individual bicollateral bundles are similar in 

 organization to those of the stem. 



LITERATURE CITED 



I. Anderson, D. B., "Uber die Struktur der Kollenchymzellwand auf Grund 

 mikrochemischer Untersuchungen." Akad. Wiss. Wien. Math. -Nat. 1^6: 

 419-440, 1917. 



L. Bailey, L. H., Standard Cyclopedia of Horticulture, id ed.. The Macmillan Co., 

 1917. 



3. , Manual of Cultivated Plants, The Macmillan Co., 1914. 



4. BoswELL, V. R., et al., "Descriptions of types of principal American varieties 



of tomatoes." U. S. Dept. Agr. Misc. Publ. 160, 1933. 



5. Bouquet, A. G. B., "An analysis of the characters of the inflorescence and 



the fruiting habit of some varieties of greenhouse tomatoes." Cornell Univ. 

 Agr. Exp. Sta. Met?/, i^q, 1931. 



6. Caldwell, J., "A note on the dichotomous branching of the main stem of 



the tomato (Lycopersicum esculentum)." Ann. Bot. 44: 495-498, 1930. 



