IV] BURIED BUDS 35 



beneath the tissues of the leaf-base. The most striking 



Fig. 19. Leaf of Plane, Platanus, detached to show the bud which 

 was hidden in the base of the petiole, and the circular leaf-scar left 

 round the base of the bud (G). 



examples of this are afforded by the Plane (Figs. 19 and 

 20) and Robinia\ in the former the bud is at once exposed 

 on gently pulling off the leaf, the base of the petiole being 

 found to leave an almost circular scar as a ring round the 

 cone-shaped bud which was tucked in a funnel-like cavity 



Fig. 20. Longitudinal 

 section of the axillary bud 

 of the Plane, invested by 

 the base of the petiole p and 

 communicating with the ex- 

 terior only by the aperture 

 at h. At st the cap-like in- 

 vesting stipules forming the 

 bud-scales. Between these 

 the cavities are filled with 

 leaves bearing hairs. 



now visible in the petiole. In Robinia there may be more 

 than one bud, deeply buried in the tissues of the leaf-scar. 

 In Philadelphus, also, the buds are thus buried. 



32 



