46 
ALBAN STEWART 
This article was prepared in the Department of Botany, University of 
Wisconsin. The writer wishes to acknowledge the many courtesies shown 
him by members of the department while the work was in progress. Dr. 
S. B. Fracker, of the Wisconsin State Department of Agriculture, very 
kindly identified the organism causing the insect gall. 
Florida State College for Women, 
Tallahassee, Florida. 
BIBLIOGRAPHY 
\. Cosens, A. A contribution to the morphology and biology of Insect galls. Trans. 
Canad. Inst. 9: 297-387. 1912. 
2. deVries, H. Ueber Wundholz. Flora 59: 2-8, 17-25, 38-45, 49-55, 81-88, 97-108, 
113-121, 129-139. Pis. I-III. 1876. 
3. Kiister, E. Die Gallen der Pflanzen, p. 435. 191 1. 
4. Maule, G. Faserverlauf im Wundholz. Bibl. Bot. 33: 1-32. Pis. I-II. 1895. 
5. Sinnott, E. W. Investigations on the phylogeny of the angiosperms I. The anatomy 
of the node as an aid in the classification of the angiosperms. Amer. Journ. Bot. i : 
303-322. Pis. XXX-XXXV. 1914. 
6. Smith, E. F. The structure and development of crown gall. U. S. Dept. Agr. Bur. 
PI. Ind. Bull. 255: 1-60. Pis. I-CIX. 1912. 
7. Solereder, H. Systematic anatomy of the dicotyledons, i: 644. 1908. 
8. Stewart, A. Notes on the anatomy of the Punctatus gall. Amer. Journ. Bot. i: 
531-546. Pis. LI-LII. 1914. 
9. . Notes on the anatomy of Peridermium galls i. Amer. Journ. Bot. 3: 
12-22. PI. I. 1916. 
10. . Concerning certain peculiar tissue-strands in a Protomyces gall on Am- 
brosia 'trifida. Science 43: 365-366. 1916. 
11. Vochting, H. Uber Transplantation am Pflanzenkorper, p. 162. Pis. I-XI. 1892. 
EXPLANATION OF PLATE II 
All drawings are from the stem of Ambrosia trifida L. Figures 4, 5, 6, 7, 9, 10, and 11, 
show detailed structure. Because of the low magnification the remainder of the drawings 
are diagrammatic. 
Fig. I. Tangential section through wood of normal stem. X 28. 
Fig. 2. Tangential section through gall of Papaipema nitela. X 28. 
Fig. 3. Tangential section through gall of Protomyces andinus. X 28. 
Fig. 4. Longitudinal section through gall of Protomyces andinus showing structure of 
tissue strands. X 133. 
Fig. 5. Cross section of tissue strand from gall of Protomyces andinus. X 133. 
Fig. 6. Cross section of normal phloem. X 133. 
Fig. 7. Cross section of phloem of gall of Protomyces andinus. X 133. 
Fig. 8. Cross section of gall of Protomyces andinus. The upper portion alone shows 
abnormalities. X 6. 
Fig. 9. Bundle ellipse from gall of Protomyces andinus. X 133. 
Fig. 10. Bundle ellipse from traumatic wood. X 133. 
Fig. 1 1 . Proliferation of ray tissue into gall cavity in gall of Papaipema nitela. X 133^ 
Fig. 12. Tangential section through traumatic wood showing course of fibers and 
vessels. X 28. 
Fig. 13. Tangential section through traumatic wood showing fiber inclusions in the 
broad rays. X 28. 
