746 EXPERIMENT STATION RECORD. [Vol.41 



Cooperation in plant quarantine service among (the) Pan American coun- 

 tries, J. R. Johnston (Proc. 2. Pan Amer. Sci. Cong., 1915-16, vol. 3, pp. 884- 

 888). — This discussion is in line with those previously noted (E. S. R., 41, p. 

 654). A short list of related publications is also given. 



Concerning' the introduction into the United States of extra limital wood- 

 destroying fungi, J. R. Weir {Mycologia, 11 (1919), No. 2, pp. 58-65). — Recent 

 observations noted in part (E. S. R., 39, p. 357) regarding fungi as related to 

 climatic modifications due to altitude are here cited to support the view that 

 extended investigations in tropical countries are highly desirable in order to 

 increase the safeguards against the importation of plant disease fungi, which 

 may here find more favorable conditions and cause more injury than is usual 

 to them in their native environment. 



New Japanese fungi: Notes and translations, IV, T. Tanaka {Mi/eologia, 

 10 {1918), Nos. 2, pp. 86-92; 6, pp. 285-288; 11 (1919), Nos. 2, pp. 80-86; 3, pp. 

 148-154).— This continues the series formerly noted (E. S. R., 39. p. 753). 



A novel method of ascospore discharge, D. Atanasoff (Mycologia, 11 (1919), 

 No. 3, pp. 125-128, figs. 3). — The author notes a method of ascospore discharge, 

 observed in species of Pyrenophora and Pleospora, which is described as unique 

 and somewhat complicated. 



A study of some factors influencing the stimulative action of zinc sulphate 

 on the growth of Aspergillus niger. — II, A comparison of two strains of the 

 fungus, R. A. Steinberg (Bui. Torrey Bot. Club, 46 (1919), Ko. 1, pp. 1-20, fign. 

 4). — Continuing previous work (E. S. R., 40, p. 222), the author publishes some 

 results of interrupted work and observation involving two strains of A. niger 

 which were continued for more than six months. The apparent effects of 

 zinc are noted with discussion. 



The author considers it probable that the differences apparent in the litera- 

 ture of the subject between the results obtained by different investigators 

 are at least in part attributable to the use of strains having different zinc 

 optima. The unrecognized presence of zinc in minute quantity may have been, 

 it is thought, an additional factor in such cases. 



Studies in the genus Gymnosporangium. — II, Report on cultures made in 

 1915 and 1916, B, O. Dodge (Bui. Torrey Bot. Club, 45 (1918), No. 7, pp. 

 287-300, pi. 1 ) . — The author has followed up as far as 1918 his work related to 

 that previously reported (E. S. R., 35, p. 244; 41, p. 152), and gives a tabu- 

 lation with discussion of observations made on cultures of O. clmHpes, G. 

 macropus, G. globosum, G. ellisii, G. clavariwforme, G. juvenescens, G. nidu8- 

 ains, G. transformans, and G. fraternum. 



Studies in the genus Gymnosporangium. — III, The origin of the teleuto- 

 spore, B. O. Dodge (Mycologia, 10 (1918), No. 4, pp. 182-193, pis. 3).— Having 

 employed as material for this work some of the above-named fungi, the author 

 gives an account with discussion of his observations. The origin of the teleu- 

 tospores from the subterminal cells of the tissues composing the primordium 

 has been shown to be a very common method in this genus of the rusts. The 

 hosts attacked by the six species studied represent three species and two gen- 

 era of conifers. 



Take-all and flag smut, two wheat diseases new to the United States, H. B. 

 Humphrey and A. G. Johnson (TJ. S. Dept. Agr., Farmers' Bui. 1063 (1919), 

 pp. 8, figs. 4). — A popular description is given of take-all and flag smut, two dis- 

 eases of wheat and other cereals which have recently been discovered in the 

 United States. The take-all disease, which is attributed to Ophiobolu-s graminis, 

 is believed to be identical with this disease in Australia and Europe. It first 

 made its appearance in Madison County, 111., and as reported July 25, 1919, it 



