PLATE XVIII. 



Pago. 

 Figs. 1-5. Betula Stevensoni, 6r. 2 139 



Figs. 6-a. Alnus Kefersteinii, Gr. 2, 3, 4 & 140 



ties. 9-11. CoRYLUS Mac Quarru, 6r. 2 144 



10 a. Border of leaf, magnified. 



