miscellaneous: experimental teratosis 



621 



f 



y 



Fig. 453. — Cross-section of a leaf of Begonia phyllomaniaca showing early- 

 stages of adventive shoots at x and y. The dark central band is the only part of 

 the leaf producing chlorophyll. From series V at end of three weeks. Photo- 

 graphed in water from a thick free-hand section. 8 mm., 4 oc, bellows at 35. 



