350 



MESSES. CrEIL WEST A'ND H. TAKEDA ON 



suberized (text-fi 



These cells ultimately become torn apart, and in this way 



gular fissures are produced in the oldest parts of the cortex (PL 33. fig. 7 ; PI 



figs. 56-58) 



It frequently happens that these fissures meet in the interior of the cortex, in which 

 50 irregular fragments of cortical tissue, including portions of unmodified parenchyma, 



Text-fig. 6. 



Text-fig. 7. 





•<^^^^CTs 



''■ji^S^rT 



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,--v 





'' *_ 



,™r.:rl^ 



ii:v 



* * 



>»* 



v^ 



:-^>.:i»- 



Isoetes japoniqa. Diagram showing early stage of 

 decortication. The stretched cortical cells are indi- 

 cated by the areas included by the dotted lines. 

 From a transverse section of a lobe of the candex. 



Isoetes jaj)onica. Diagram 



showing: later stage of 



decortication. The dotted areas denote cells with 

 suberized walls. From a transverse section of a lobe 

 of the caudex. x 6. 



X 6. 



Text-fig. 8 





^< 





.*. r^i 



Isoetes japontca. Diagram showing a late stage of decortication. The fragment A is con 



cut off from the cortex. From a transverse section of a lobe of the caudex. x 6. 



m 



become more or less isolated and finally break away (text-figs. 7 



cells bordering these fissures form a thin lay 



that of the 



primary 



of the stem and of the rhizoph 



. The suberized 

 of periderm., wliich is continuous with 



A somevvbat similar 



