42 



Bulletin 194 



Swamp Sprnce. Black Spruce 



m 



if 



(Mich. Trees). 



1. Winter branchlet, x 1. 



2. Leaves, x 2. 



3. Cross-sections of leaves, enlarged. 

 4-5. Opened cones, x 1. 



6. Cone-scale with seeds, x 1. 



