128 



Mycologia 



Matz, J. Investigations of root disease of sugar cane. Jour. 



Dept. Agr. Porto Rico 4: 28-40. /. 1-6. Ja 1920. 

 Matz, J. El Mai del guineo. Puerto Rico Dept. Agr. y Trab. 



Circ. 25 : 1-7. My 1920. 

 Nowell, W. & Williams, C. B. Sugar cane blight in Trinidad : a 



summary of conclusions. Bull. Dept. Agr. Trinidad & Tobago 



19 : 8-10. 1920. 



Reed, G. M. Varietal resistance and susceptibility of oats to pow- 

 dery mildew, crown rusts and smuts. Mo. Agr. Exp. Sta. Re- 

 search Bull. 37: 3-41. pi. 1-4. Jl 1920. 



Robbins, W. J. & Massey, A. B. The effect of certain environ- 

 mental conditions on the rate of destruction of vanillin by a 

 soil bacterium. Soil Sci. 10 : 237-246. /. 1. S 1920. 



Stakman, L. J. A Helminthosporium disease of wheat and rye. 

 Univ. Mo. Agr. Exp. Sta. Bull. 191 : 1-18. pi. 1-5. Jl 1920. 



Stillinger, C. R. Apple black rot (Sphaeropsis malorum Berk.) 

 in Oregon. Phytopath. 10: 453-458. 1920. 



Taubenhaus, J. H. Wilts of the watermelon and related crops 

 (Fusarium wilts of cucurbits). Texas Agr. Exp. Sta. Bull. 

 260 : 3-50. f. 1-16. F 1920. 



Thiel, A. F. & Weiss, F. The effect of citric acid on the germina- 

 tion of the teliospores of Puccinia graminis Tritici. Phytopath. 

 10: 448-452. /. 1. 1920. 



Whiting, A. L. & Hansen, R. Cross-inoculation studies with 

 nodule bacteria of lima beans, navy beans, cowpeas, and others 

 of the cowpea group. Soil Sci. 10: 291-300. O 1920. 



Wolf, F. A. A little-known vetch disease. Jour. Elisha Mitchell 

 Sci. Soc. 36 : 72-85. pi. 2-6. S 1920. 



Caused by Protocoronospora nigricans Atk. & Edg., of the Melanconiaceae. 



