Diseases of plants. 845 



on the fruit, leaves, and tender twigs of the spice bush. This is claimed to be 

 due to an active parasite identical with G. officinale from the sassafras, and 

 also with O. fructigenum, which causes bitter rot of the apple. 



A disease of Gerbera, L. Maffei (Riv. Patol. Veg., 6 {19 IS), No. 9, pp. 257- 

 259). — ^A brief account with description is given of a fungus, Ascochyta gerherce 

 n. sp., attacking leaves of O. jamesoni, recently introduced into Italy from 

 South Africa. 



A disease of Washingtonia, G. Poieault and A. Sartoky (i. Cong. Intemat. 

 Pathol. Compar^e [Paris], 1912, vol. 2, Comp. Rend., pp. 911, 972). — Two species 

 of Washingtonia, W. fiUfera and W. robusta, are said to show progressive at- 

 tacli from a disease decolorizing the leaves and suspected to be due to a 

 Penicillium. 



Notes on some diseases of trees in our National Forests, IV, G. G. Hedg- 

 cocK {Phytopathology, 4 {1914), No. 3, pp. 181-1S8). — In continuation of a 

 previous report (E. S. R., 29, p. 851), the author gives an account of the infec- 

 tion of various forest trees by Herpotrichia nigra, Neopeckia coulteri, Forties 

 pinicola, F. fomentarius, F. applanatus, Polyporus schweinit:sii, and F. roseiis. 

 Most of these fungi are found parasitic on various species of coniferous trees. 



Bark disease of the chestnut in British Columbia, J. H. Faull and G. H. 

 Graham {Forestry Quart., 12 {1914), No. 2, pp. 201-203) .—Specimens of bark 

 taken from diseased chestnut trees at Agassiz, British Columbia, have been 

 examined, and all tests so far made indicate that the fungus is identical with 

 Endothia parasitica, the cause of the chestnut bark disease. The trees growing 

 at Agassiz are of Oriental, European, and American origin. Inoculations con- 

 stituting the final tests are to be reported on later. 



Pathological histology of the Endothia canker of chestnut, W. E. Keefee 

 {Phytopathology, 4 {1914), No. 3, pp. 191-200, figs. S).— The author describes 

 the different anatomical conditions shown in the bark and sapwood of chestnut 

 when attacked by E. parasitica. 



In an experiment conducted to determine the depth to which the fungus 

 penetrates into the wood, it was found that the average depth of penetration 

 for about 20 logs was approximately J in., the greatest penetration being about 

 i in. The deepest penetration was found in the smaller limbs. 



Damage due to oak mildew in Hungary, F. Kovessi {1. Cong. Intemat. 

 Pathol. Compar4e [Paris'], 1912, vol. 2, Comp. Rend., pp. 924-936) .—Giving a 

 brief account of the spread in Europe of oak mildew after its appearance about 

 1907, with comments on its possible relations to altitude, weather, caterpillars, 

 etc., the author states that among the more susceptible of European oaks are 

 Quercus tozza, Q. pedunculata, Q. sessiliflora, Q. pubescens, Q. contorta, Q. cerris, 

 Q. ilex, Q. suher, and Q. coccifera. The American oaks are said to be more 

 resistant than natives. Fagus sylvatica and Castanea vulgaris appear to be 

 rarely attacked. 



Of the various remedies mentioned, flowers of sulphur is said to be the 

 cheapest and most efficacious in this connection. 



An extensive bibliography is given. 



Notes on economic fungi, M. T. Cook (Phytopathology, 4 {1914), No. 3, pp. 

 201-203, figs. 2). — A brief account is given of the crown gall due to Pseudomonas 

 tumefaciens on Bolleana poplars, and of the occurrence of a sclerotium which 

 contained a mass of well developed asci containing spores in potatoes infected 

 by Rhizoctonia. 



North American species of Peridermium on pine, J. C. Arthur and F. D. 

 Keen {Mycologia, 6 {1914), No. 3, pp. 109-138). — Sixteen species are described, 

 of which P. cahfornicum and P. guatemalense are considered to be new species. 

 A host index is given of species of Peridermium on species of pines. 



