PLATE XXIV. 



Page. 



Figs. 1,2. Popuuis monodon, Gr. 1 180 



Figs. 3, 4. Populus motabius var. f. ovalis, Gr. 1,2 177 



Fig. 5. PoPUius Ungeri, Gr. 1 175 



Figs. 6-8. Populus subrotundata, Gr. 2, 3 173 



