April, 1920] PATHOLOGY 171 



tica, the life history of the fungus including observations on the "primary nucleus" and 

 anatomy of the diseased tissues. It is pointed oul thai the so called "primal i lus" 

 may be the host nucleus which has been surrounded or engulfed by the parasite within 

 cell and that the warty growths are composed largely of fundamental and vascular 



constituting a hyperplastic overgrowth. — C. R. Orton. 



1187. Orton, W. A. Protect seed potatoes against disease. Potato Mag. l u : 8 7, 

 1-6. 1919. — Indicates value of protection and describes methods for it. Dona 



1188. Paynter, L. Control of black-spot of pear. New Zealand Jour. Agric. 18: 221. 

 1919. — The results and costs of spraying tests are given for control of this disease (Fusirla- 

 dium pyrinum). — E. R. Hodson. 



1189. Petri, L. Le galle del "Capparis tomentosa" Lam. prodotte dalla "Discella cap- 

 paridis" Pat. et Har. [Galls of Capparis caused by Discella.] Ann. Botany [Roma] 14: 111- 

 150. S fig., 1 pi. (colored). 1917 (1918). — From the microscopic examination of sections free 

 hand and from paraffin embeddings the author concludes that the excrescences on the st 

 and leaves of Capparis tomentosa are caused by Discella capparidis. Penetration of the 

 mycelium into the cells of the host causes the gradual substitution of the plasmic content*. 

 The leaf galls are not different histologically than those of the stems. Harmonious relation- 

 ship of the symbionts does not exclude real parasitism. — J. A. Nieuwland. 



1190. Petri, L. Nuove vedute sulle cause dell' arricciamento della vite. [New views on 

 the cause of "arricciamento" of the grape.] Atti R. Accad. Lincei (Rend. CI. Sci. fis. mat. e 

 nat.) V, 27 2 : 271-275. 1 fig. 1918. — This disease is believed to be infectious as healthy cut- 

 tings grown in infected soil contract the disease. When grown in the same soil after steril- 

 izing at 120°C. the disease did not appear. Infected vines did not recover in five years even 

 when grown under best conditions. When affected vines are replaced by healthy vines, the 

 new vines are soon affected. Washings from soil around affected vines carry disease but 

 when filtered through Kitasato filter no longer carry it. The disease is characterized by 

 certain abnormalities in the growth of the roots some of the cells of which are penetrated 

 by a microorganism which presents the morphological characters of a Plasmodium. — F. M. 

 Blodgett. 



1191. Rant, A. The white root-fungus of cinchona. Recueil Trav. Bot. N6erland. 14: 

 143-148. 1 pi. 1917. — Two root-fungi distinguished as white and gray are referred to. By 

 means of pure cultures and infection experiments it was demonstrated that the gray n 

 fungus of Cinchona belongs to the genus Rosellinia and produces Graphium as a lower fructi- 

 fication both naturally and in culture. — The white fungus attacks usually trees of older growth 

 of C. ledgeriana and C. robvsta. On the external side of the bark, black rhizomorphs resem- 

 bling Armillaria mcllea of Europe are found. The plant is Armillaria mcllca (Yahll Quel. 

 var. javanica P. Henn. Methods for the preparation of pure cultures are emphasized and 

 the precautions necessary explained. A dilute agar-glucose-peptone-potassium acid phos- 

 phate was used; moss, living twigs of Acer pseudoplatanus and water for other substrata. — 

 J. A. Nieuwland. 



1192. Roberts, John W., and Leslie Pierce. Control of cherry-leaf spot. U. S. Dept. 

 Agric. Farmers Bull. 1053. 8 p. 1919. 



1193. Sanborn, C. B. Oklahoma and certified seed. Potato Mag. l u : 23. 1919. 



1194. Savastano, L. Sul marciume radicale negli agrumeti italiani. [On root rot of the 

 Italian citrous orchards.] Boll. R. Staz. Sperim. Agrum. e Frutt. Acireale 35: 1 -8. 1919.— 

 This is a complex form of disease due to divers pathologic causes acting singly or in combina- 

 tion. These causes may be divided into two groups: (1) organic, among which should be 

 classed bacteria (pathogenic or non-specifically pathogenic) and lower fungi: (2) physical, 

 among which should be classed root asphyxia due to excessively compact soil and subsoil and 

 stagnant water. Besides these apparently immediate causes the following be condi- 



