22 
ALB AN STEWART 
17. Stewart, A. Notes on the Anatomy of the Punctatus Gall. Amer. Journ. Bot. 
i: 531-546, pl. 51-52. 1914. 
18. Wornle, P. Anatomische Untersuchung der durch Gymnosporangium-Arten 
hervorgerufenen Missbildungen. Forstl. Naturw. Zeitschr. 3: 68-84, 129- 
172. 1894. 
EXPLANATION OF PLATE I 
All figures are from the jack pine, Pinus Banksiana. 
Fig. I. Cross section through a portion of a gall showing abnormally produced 
Tesin canals and thin-walled summer tracheids. X 65. 
Fig. 2. Tracheid whorl or "ball-formation" from tangential section of gall. 
X 65. 
Fig. 3. Portion of a radial section through gall showing alternate arrangement 
of pits. X 125. 
Fig. 4, Portion of a radial section through gall showing irregularities in walls 
of tracheids, peculiar ray tracheids, and alternate pitting. X 125. 
Fig. 5. Portion of a tangential section through gall showing a tendency towards 
a broadening of the rays. X 125. 
Fig. 6. Tangential section of traumatic wood. X 65. 
