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EXPLANATION OF THE PLATE. 



Plate DXCVL Picea Mariana. 



1. A branch with staminate flowers, natural size. 



2. A staminate flower, enlarged. 



3. An anther, front view, enlarged. 



4. A branch with pistillate flowers, natural size. 



5. A scale of a pistillate flower, upper side, with its ovules, enlarged 



6. A scale of a pistillate flower, lower side, with its bract, enlarged. 



7. A fruiting branch, natural size. 



8. A cone-scale, lower side, with its bract, natural size. 



9. A cone-scale, upper side, with its seeds, natural size. 



10. A seed-wing, the seed removed, enlarged. 



11. Cross section of a leaf magnified fifteen diameters. 



12. Winter-buds, natural size. 



13. A seedling plant, natural size. 



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