546 
ALBAN STEWART 
1 6. Mer, E. Recherches sur la maladie des branches de Sapin causee par le Phoma 
abietina R. Hartig. Jour, de Bot. 7: 364-375. 1893. 
17. Molliard, M. Recherches sur les Cecidies Florales. Ann. Sci. Nat. Bot. Ser. 8, 
i: 67-245. PI. 3-14. 1895. 
18. Sinnott, E. W. See Bailey, I. W. and Sinnott, E. W. 
19. Solereder, H. Systematic Anatomy of the Dicotyledons, English translation. 
2. 1908. 
20. Stewart, A. Some observations on the anatomy and other features of the 
Black Knot. Am. Jour. Bot. i: 1 12-126. 1914. 
21. Weidel, F. Beitrage zur Entwicklungsgeschichte und vergleichenden Anatomic 
der Cynipidengallen der Eiche. Flora 102: 279-334. PI- I5- 191 1. 
DESCRIPTION OF FIGURES IN PLATES LI AND LII 
All figures are of the Punctatus gall from Quercus velutina. 
Plate LI 
Fig. I. Cross section of a very young gall showing larval chamber. X 13. 
Fig. 2. Longitudinal section through a larval chamber shortly after it has been 
vacated by the insect. X 9. 
Fig. 3. Tangential section through an old gall showing a portion of the complex 
of isodiametric parenchyma cells near the base of the larval chamber. X 33. 
Fig. 4. Tangential section showing pseudo-fibrovascular bundles around a 
portion of a larval chamber. A part of the protecting layer is shown on the lower 
side of the figure. X 33. 
Fig. 5. Tangential section through a gall showing a larval chamber being 
enclosed by woody tissue. Intermediate between the stages shown in figs, i and 2. 
X 9. 
Fig. 6. Woody inclusion in the bark of the gall. Light colored body at center 
of figure. X 33- 
Fig. 7. A cork inclusion in the bark of the gall. Light area surrounding the 
center. X 33. 
Plate LII 
Fig. 8. Tangential section through outer woody covering of gall showing 
uniseriate and compound rays. X 33. 
Fig. 9. Tangential section through central portion of gall showing only narrow, 
mostly uniseriate rays. X 33. 
Fig. id. External view of the punctatus gall. Openings to chambers shown by 
dark dots. X about ^. 
Fig. II. Tangential section through a portion of the stem below gall showing 
nearly normal ray structure. Photograph taken from same section as part shown 
in figure 9. X 33- 
Fig. 12. Cross section of a portion of a gall showing radial sector containing 
vessels in the wood of the gall. X 33. 
Fig. 13. Tangential section showing ball-formation (Knauel) in wood of gall. 
X33. 
Fig. 14. Cross section of a portion of an old gall showing apparent return to 
normal growth. The light line across the figure is caused by a slight separation of 
the wood and bark at the cambium. X 33. 
