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Fig. 64. Above, two cultures of cambium of Sambucus JHtfra 

 grown side by side on a semi-solid nutrient in such a manner that 

 a graft union formed at the center. The exact line of fusion can- 

 not be distinguished, x 100. Below, cultures of cambium of Acer 

 pseudoplatanus grown as in the picture above. The graft union 

 was much less perfect here, x 150. (From Gautheret, R. J. 1935. 

 Recherches sur la culture des tissus vegetans. (These) 250, plate 

 XVIII, 1, 2, 15.) 



