PLANE 218 



notch at the top, and is covered with fine caducous hairs. 

 As the bud increases this split-scale is pushed to one side. 

 The next inner scale is anterior, and is followed by about 

 6 9 others before the laminae are distinguishable. The 

 arrangement is spiral, the leaf-segments obliquely involute. 



tt Twigs not remarkably thick and often slim ; 

 never with latex ; leaf-scars small or very 

 thin; terminal bud usually present. 



Buds conical and showing one cap-like 

 scale almost enclosing a second scale, 

 surrounded at its base by the narrow ring- 

 like scar of the fallen leaf; bvd-scales 

 brown; twigs zig-zag, olive-green or grey, 

 pubescent at the tips. 



Platanus occidentalis, L. Plane (Figs. 109 and 19, 20, 

 37). The buds are equal in size, and completely hidden in 

 the base of the leaves in summer, the ring-like insertion 

 of which is nearly but not quite closed (Figs. 19 and 20). 

 The leaf-scar is sinuous on its outer margin, and has the 

 numerous leaf- traces grouped in threes and fives (Fig. 59 A;). 

 Bud-scales often more or less twisted, but not drawn to a 

 long point, striate, more or less silky pubescent, and pale 

 brown or olive. Twigs rounded, slightly rilled, and with 

 traces of tomentum at the nodes ; olive-green, with nume- 

 rous tawny minute lenticels, passing to olive-grey smooth 

 branches which soon show the characteristic casting of 

 the periderm in thin plates. 



The development of the bud in a hollow at the base 

 of the petiole, and opening by a minute aperture at the 

 upper side, is shown in Fig. 20. The somewhat leathery 

 outer bud-scales are closed stipules, fitting cap-like one 

 over the other, and getting more delicate in texture as we 

 proceed inwards. Then come the small revolute leaves, 



