Fie. 19. — Thin intercellular hyphae (arrows) near the outer margin of the 

 needle. By early April they were fully extended and quite regular in diameter. 

 (X 800) 



Fig. 20. — Longitudinal view of the mesophyll just below the lower epidermis. 

 A stomate and its guard cells are visible at the upper left. Globular septate 

 hyphae are abundant in the chlorenchyma. April 1956. (X 1200) 



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