750 EXPERIMENT STATION RECORD. 



material sent from the Malay Peninsula, Tropical Africa, Natal, and Qneens- 

 land, among which is Piiccinia a/nihopogrniis, a very destructive parasite on 

 lemon grass in tlie Botanic Gardens at Entel»lie, Uganda. 



On a new organ of the Mucorineae, F. Gueguen {Compt. Rend. Acad. Sci. 

 [Paris], 152 {1911), No. 24, pp. lOSJf, 168.5).— The author gives the morpho- 

 logical and cytological characteristics of certain peculiar bodies which were 

 found on the hyphae of a new species of Mucor and suggests the physiological 

 function. of these bodies. The bodies, which are oblong and bladder-like, with 

 digitate prolongations, were produced on sporophore-like structures and are 

 supposed to be organs for the elimination of certain metabolic products of the 

 fungus. 



Some experiments with fungicides used for the prevention of stinking 

 smut, F. DiTZELL and R. G. Downing (Affi: Gaz. JSf. 8. Wales, 22 {1911), No. 4, 

 pp. 341-357). — This is a report of further experiments with fungicides (E. S. R., 

 23, p. 742). The i-elative efficiency of the various fungicides in destroying the 

 bunt spores, the effect of the fungicides on germination, and the efficiency of 

 each fungicide in preventing reinfection are given in tabular form. 



Copper sulphate, copper sulphate and lime water, copper sulphate and salt 

 (NaCl), copper sulphate solution in water, Fungusiue, and Bordeaux paste 

 all proved excellent preventives of bunt and each was also satisfactory in 

 preventing reinfection, but the copper sulphate and salt solutions seriously 

 injured the germination of the grain. Formalin, scalecide, and lysol were not 

 regarded as satisfactory fungicides for the control of bunt. 



On potato leaf blotch and leaf curl, A. S. Horne {Jour. Boy. Hort. Soc. 

 [London], 36 {1911), No. 3, pp. 618-623, pi. i).— The author describes the oc- 

 currence of a form of leaf curl in Scotland which developed on the President 

 variety of potato, the seed tubers of which originated from tubers imported 

 from Holland. 



Plants grown from native seed tubers of the same variety w^ere free of the 

 disease. 



The plants which were examined late in the season were stunted and yel- 

 lowish with leaves more or less curled and marked with dark brown patches, 

 much smaller and darker than those caused by the late blight. Cross sections 

 of the blotched areas showed that the epidermal cells of both surfaces were 

 diseased and discolored, especially the guard cells of the stomata. The disease 

 extended inward to the palisade tissues and mesophyll and sometimes reached 

 as far as the fibrovascular bundles, but there was nothing to indicate that the 

 diseased spots originated from the bundles. Among the several kinds of spores 

 found on the surface of the leaves were those of a Macrosporium. 



It is suggested that the fungus associated with this disease exists on the 

 skin of the potato, and that, owing to the elongation of growing organs, it is 

 carried upward externally to the various parts of the plant. 



Articles by the committee on the leaf-roll disease of the potato, F. W. 

 Dafekt {Ztschr. Landw. Versuchsw. Osterr., 14 {1911), No. 5, pp. 757, 758). — ■ 

 This is a brief note on the personnel of the committee appointed to investigate 

 the leaf-roll disease of the potato in general, and on the scope of the work. 



Aiticles by the committee on the study of the leaf -roll disease of the 

 potato. — II, Studies on the cause and propagation of this disease, G. KocK 

 and K. Kornauth {Ztschr. Landiv. Versuchsir. Osterr., 14 {1911), No. 5, pp. 

 759-805). — As a result of their investigations, the authors decide that the leaf- 

 roll disease can be propjigated from one year to the next by means of diseased 

 peed tubers, i. e., from seed tubers grown on leaf-roll diseased plants; also that 

 infected soil is capable of producing the leaf-roll disease in plants grown from 



