454 EXPERIMENT STATION RECORD. [Vol.35 



Bacterial diseases of plants are said to be of no great economic importance 

 in Ilussia, and the majority of them are confined to beets. Special attention is 

 given by the author to the Bacterium beticola described by E. F. Smith, which 

 produces galls on Beta vulgaris. The character of this disease as observed 

 on local specimens is slightly different from that described in America by 

 Smith. Crown gall (Bacterium tumefaciens) is present, but the data regarding 

 its prevalence and importance in the province are not complete. An unde- 

 scribed species of bacterium, named Bacillus petroselini n. sp., is said to cause 

 a leaf spot of Petroselimun sativum. The author made a special study of a 

 bacteriosis of cucumbers, and he concludes that this trouble is identical with 

 one which was previously reported by Burger in Florida (E. S. R.. 31, p. 747). 

 A description is given of the causal organism. Bacillus burgeri n. sp. 



The group Amcebina (Monadineae) is given a lengthy discussion. The author 

 describes PolUnopsis betw n. g. and sp. and Amosba cucumeris n. sp. The first 

 was isolated from beets affected with Bacterium beticola, and the presence of 

 bacteria appeared to be necessary for the development of the amoeba, but the 

 question of the pathogenicity of the latter is considered to be an open one. The 

 second organism was obtained from cucumbers affected with Bacillus burgeri, 

 and upon examination of local specimens, as well as herbarium specimens from 

 Copenhagen, Denmark, it appeared to be constantly associated with this disease. 

 The author believes that the question of the relation between the bacterium and 

 the amoeba is of considerable interest from the phytopathological point of view. 



The Phycomycetes give a large number of plant parasites in these provinces. 



Complete technical descriptions accompany nearly all parasitic organisms in 

 this book. 



[Mycological flora of the region of Sukhum], V. Siemashko (Mat. Mikol. 

 i Fitopatol. Ross., 1 (1915), No. S, pp. 23-41, figs. i7).— The author gives a list 

 of fungi collected by him in 1913 and 1914 along the Black Sea coast in Trans- 

 caucasia. 



Along with parasites and saprophytes of more or less general occurrence this 

 list contains six species described as new to science. One of these, E.xobasidium 

 citri, attacks young mandarin fruits, forming on their surfaces a heavy scle- 

 rotial layer bearing numerous spores. The disease in general symptoms 

 resembles that which Briosi and Farneti ascribed to an aggregate action of 

 Ovularia citri and certain other fungi, but the author's fungus is a distinct 

 Basidiomycete. The other five new species, which attack leaves of various 

 plants, are Mycosphcerella phaseolortmi from Olycine soja, Phaseolus mungo, 

 and Vigna rubra; Sphwrulina suchumica from Gossypium hcrbaceum and 

 Hibiscus esctilentus; Cercosporella epimcdii from Epimedium pinnatum col- 

 chicum; Ramularia trachystemonis from Trachystemon orientalis; and Cercos- 

 pora guizotiw from Guizotia oleifera. 



[Mycological flora of Province Tersk], N. N. Vokonikhin (Woeonichin) 

 (Mat. Mikol. i Fitopatol. Ross., 1 (1915), No. 3, pp. 7-16).— The author gives a 

 list of fungi which he collected during the summer of 1914 in the regions of 

 Kislovodsk, Pfktigorsk, and Zhelffeznovodsk, Russian Caucasus. This list in- 

 cludes two parasitic species hitherto undescribed, namely, Rhodosticta onobry- 

 chidis n. sp., which attacks the leaves of sainfoin (esparcet), and Cercosporella 

 lini n. sp., from Linum nervosum. Leaf spot (Septoria piricola) and rust 

 (Gymnosporangiiim sabinm) of pear, fruit rot (Monilia cinerea) and shothole 

 (Clasterosporium carpophilmn) of cherry, Microstroma juglandis on leaves of 

 walnut, and Cercospora fraxini and Septoylceum ulmi on leaves of forest trees 

 were the most prevalent of the well-known diseases of economic plants. 



The Septoria leaf spot disease of celery or celery blight, G. H. Coons and 

 E. Levin (Michigan Sta. Spec. Bui. 77 (1916), pp. 8, figs. 9; Dutch ed., pp. 8, 



