PLATE VIII. 



Page. 



Fui. 1. Popiilus hyperborea Heer 43 



2-4. Popiilus Berggreni Heer 42 



' T). Popvilites litigiosus (Heer) Lesq 46 



6. Fruiting catkin of Salix 51 



7. Platanns priniicva Lesq 72 



H, 8''. Flo\vers of Platanus prim aiva Lesq 72 



274 



