134 Gnayule. 



Description of Plate 25. 



1-6. Primary endodermal resin-canals of the hypocotyl. 



1. Cell lineage (diagrammatic). 



2. A not infrequent but abnormal behavior. 



3. Definitive condition, as regards cell-walls. 



4. Definitive condition after growth and readjustment. 



5. Endodermic stereids adjacent to canals. 



6. Stereids (pericyclic ?) just within canal in stele. 

 7-10. Transverse sections; hypocotyl. 



7. Field seedling, 1.8 mm. diameter. 



8. Irrigated seedling of slow growth. Secondary splitting apart of wood cylinder. 



9. Etiolated seedling 2 mm. diameter. 



10. Etiolated seedling 2 mm. diameter. Hypocotyl through cotyledonary collar. 

 Secondary hadrome of cotyledonary median traces is morphologically 

 cauline and distinct from primary tissue. I. c. t., Lateral cotyledonary 

 trace passing out from the stele. 



10a, 106. Cotyledonary, median traces at another level. 



