72 INDEX TO AMERICAN BOTANICAL LITERATURE 
Detmers, F. Dothichiza canker on Norway poplar. Phyto- 
pathology 13: 245-247. pl. 13. 11 My 1923. 
Dodge, B.O. Morphology and host relations of Pucciniastrum 
americanum. Jour. Agr. Research 24: 885-894. pl. I-5 
16 Je 1923. 
Douin, C. Recherches sur le gametophyte des Marchantiées. 
Rev. Gen. Bot. 35: 213-226. f. 1-27. My 1923. 
Farwell, O. A. Botrychium dissectum. Am. Fern. Jour. 13: 
42-45. 11 My 1923. 
Fernald, M. L. The gentian of the tidal shores of the St. 
Lawrence. Rhodora 25: 85-89. pl. 139. 20 Je 1923. 
Gentiana Victorinti, sp. nov. 
Fernald, M. L. The northern variety of Geum virginianum. 
Rhodora 25: 98, 99. 20 Je 1923. 
Folsom, D. Mutations of the potato. Jour. Hered. 14: 45-48. 
f. 19-21. 18 My 1923. 
Gaines, E. F., & Stevenson, F. ‘J. Occurrence of bunt in rye. 
Phytopathology 13: 210-215. f. z, 2. 11 My 1923. 
Gainey, P. L. Influence of the absolute reaction of a soil upon 
the Azotobacter flora and nitrogen fixing ability. Jour. 
Agr. Research 24: 907-938. f. 1. 16 Je 1923. 
Gericke, W. F. Further notes on effect of extent of root 
systems on tillering of wheat. Bot. Gaz. 75: 320-322. 19 
My 1923. 
Gleason, H. A. Hamamelis vernalis. Addisonia 8: 9, 10. fl. 
261. 15 My 1923. 
Native of the Ozark Mountain region. 
Grout, A. J. Leucodon julaceus (Hedw.) Sulliv., with flagella. 
Bryologist 26: 30. 16 Je 1923. 
Harper, R.A. The species concept from the point of view of a 
morphologist. Am. Jour. Bot. 10: 229-233. 10 My 1923. 
Harper, R. M. Some recent extensions of the known range of 
Pinus palustris L. Torreya 23: 49-51. Je 1923. 
