41 6 Boewig on the Histology of Cassytha filiformis L. 



7. In the root, at the point of origin of the side rootlets. 

 Fig. 8. T. S. stem. 



1. Epidermis. 



2. Cortex (chlorophylloid). 



3. Hard bast. * 



4. Remains of protophloem. 



5. Pitted vessel. 



6. Tylosis. 



7. Protoxylem. 



8. Phloem. 



Fig. 9. Pitted vessel, showing bordered pits in surface view and sec- 

 tion. 



Fig. 10. Pitted vessel and adjacent cells, showing tyloses. 



Fig. II. Same, showing extreme tyloses. 



Fig. 12. Stages in development of stomata. Epidermis viewed in 

 section. 



