204 



A TEXTBOOK OF BOTANY [Ch. IV, 12 



Fig. 152. — Begonia phyllomaniaca, which produces many small leaves 

 over leaf and stem. (From Bailey.) 



some involve both, as in case of the Willow Roses, — those 

 rose-like masses of shortened leaves often seen on the ends of 

 Willow stems. 



Fig. 153. — Typical galls, with the Insects, of Oak ; slightly reduced. 



On the left a leafy "Oak-apple," and on the right the insect in cocoon 

 and adult stages. In the center, an Oak gall, and on the right, lower, the 

 same cut open, showing the larva of the insect. (From Thom6, Text-book 

 of Botany.) 



