SYCAMORE 



181 



the bark is primarily fissured by longitudinal clefts, but 

 the ridges between are further cut transversely by cross- 

 cracks, which break the ridges up into more or less angular 

 scales. This occurs especially in species of Pyrus, and to 



=:/7'\*V^ 



Fig. 84. Acer Pseudo-Platanus, Sycamore. Bark (Irv). 



such an extent in Pyrus Malus and Cratcegus that it 

 would be almost as convenient to place them here as in 

 the other group. The phenomenon is also more or less 

 characteristic of Pyrus communis, P. Sorhus, P. torminalis 



