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Description of Plate XIX. 



1. Diagram of a cross section of a frond of Constantinea sitchen- 

 sis showing the endophytic Chlorochytrium cells on the upper (less 

 numerous) and lower surface, e. endophyte. p. pseudoepidermis. 

 /. intermediate area. c. central area of the frond. 



2. Surface view of the fi'ond of Constantinea (lower surface) 

 showing the pseudoepidermis (/) with cavities (^) through which the 

 endophytes have penetrated, x 57. 



3. 4, 5, 6. Stages in the penetration of the nurse plant, s. pyre- 

 noid. X 288. 



7. Chlorochytr i7ini cell with a not infrequent form. Shows fila- 

 mentous form of hypochlorin. x 288. 



8. Cell showing elongated form of endophyte found amongst the 

 paraphyses of the nurse plant, x 288. 



9. Large Chlorochytrium cell of typical form, x 288. 



ID. Detail showing the position of a Chlorochytrium cell in the 

 cross section of the Constantinea irond. Letters as in no. i. x 288. 



II. The outer end of a Chlorochytrium cell showing the lamella- 

 tion of the cell wall, x 288. 



