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IOWA ACADEMY OP SCIENCE Vol. XXIV, 1917 
of three weeks’ time, none had germinated. The acorns were 
sound when planted, upon being cut open the acorns were found 
to be brown, indicating that life was destroyed during the long 
period of drying out. 
Fig. 74. — Young red oak (Q. rubra ) stipules, scales below and fully formed 
leaves. Photographed May 1, 1917, by Colburn. 
Quercitron Oak ( Quercus velutina Lam.). Acorns gathered 
on September 23 were planted in greenhouse on September 24, 
in sandy humus, covered with sphagnum. The acorns did not 
Fig. 75. — Trichomes of Quercus velutina-, 1, from stem; 2, from leaf. 
Drawn by C. M. King. 
germinate until April. Although only sound acorns were planted 
the germination was only 25 per cent. 
