39C 
IOWA ACADEMY OF SCIENCE Vol. XXIV, 1917 
some cases of two or three cells, long pointed, straight or slightly 
curved, cell-walls thick, contents brown. First leaves of scales 
Fig. 79. — Young leaves of oaks: 1, Quercus imbricaria; 2, Quercus rubra; 
3, Quercus Robur var . _ pedunculata : 4, Quercus alba; 5, Quercus acuminata; 
6, Quercus lobata. Drawn by C. M. King. 
reddish, becoming green ; the scale pointed, pubescent, 
larger leaves on midrib and pubescent on margin with 
