364 SUMMARY OF CURRENT RESEARCHES RELATING TO 



According to MM. L. Kavaz and A. Bonnet,* the prevalent disease 

 of the vine in the Caucasus is entirely due to Phoma uvicola, and not 

 partially also to P. reniformis. 



On old yeast-cultures M. K. Purjewicz f finds a new species of 

 Aspergillus, which he names A. pseudoclavatus, distinguished from A. 

 clavatus by its branched sterigmas. 



lierr H. Boltshauser J describes the injuries done to cherry-trees 

 in Thurgau by the attacks of Clasterosporium Amygdalearum. 



Herr P. Magnus § describes in detail the life-history of Melampsorella 

 Caryophyllacearum, parasitic on species of Dianthus and Cerastium. He 

 identifies with it Exobasidium Siellarise Syd. 



Herr W. Eothert |] finds the seeds of Melampyrum pratense to be 

 constantly infested by a sclerote which imparts to them a dark grey 

 colour ; but the systematic position of which he was unable to deter- 

 mine. 



Prof. M. Shirai % identifies Peridermium giganteum Tub. and Cronar- 

 tium Quercuum Miy., as belonging to one cycle of generations, the former 

 being parasitic on species of Pinus, the latter on evergreen oaks. The 

 two fungi are found (in Japan) only in localities where the two host- 

 plants grow in close proximity. 



A new species of Tubercularia, T. Sbrozzi, is described by Sigg. 

 F. Cavara and P. A. Saccardo ** as parasitic on the leaves of Vinca 

 major. 



Effect of Mould-fungi on Wall-papers containing Arsenicff — Herr 

 H. 11. Schmidt has tested the truth of the current opinion that the 

 effect of mould-fungi on hangings or papers coloured by a pigment con- 

 taining arsenic, is to reduce the arsenic compound and to set free 

 arseniuretted hydrogen, by growing a number of different species in 

 nutrient solutions containing arsenic. He finds this reducing property 

 to be especially marked in four of the commonest species of mould- 

 fungi, viz. Penicillium glaucum, Aspergillus flavus, Mucor mucedo, and 

 Dematium pullulans, and to be displayed also to a less extent by nearly 

 every one of 24 species examined. 



Influence of Inorganic Salts on the Formation of Conids in Asper- 

 gillus niger.JJ — The following is the result of a series of experiments 

 on this subject made by Prof. A. Yasuda: — The formation of conids is 

 retarded in proportion to the concentration of the nutrient fluid ; the 

 size of the conidial fructification also decreases under the same condi- 

 tion ; the conid-bearing hyphae become shorter ; the black colour of the 

 conids is greatly promoted. When the solution is very concentrated, 

 the formation of conids altogether ceases. 



* Comptes Itendus, cxxx. (1900) pp. 590-2. 



t Schiiften d. Natuiforschgesell. in Kiew, xvi. (1899) 9 pp. and 1 pi. See Bot. 

 Centralbl., lxxxi. (1900) p. 109. 



% Mitth. d. Thurgauer Naturf.-Gesell., xiii. See Beih. z. Bot. Centralbl., ix. 

 (1900) p. 142. § Ber. Deutsch. Bot. Gesell., xvii. (1899) pp. 337-43 (1 pi.). 



|| Flora, lxxxvii. (1900) pp. 98-108. 



% Bot. Mag. (Tokyo), xiii. (1899) p.' 74. See Bot. Centralbl., lxxxi. (1900) p. 367. 

 ** Nuov. Giorn. Bot. Ital., vi. (1*99) pp. 322-8 (1 pi.). 



tt S.B. Pbys.-med. Soc. Erlangen, xxx. (1898) p. 18. See Zeitschr. f. angew. 

 Mikros?., v. (1899) p. 176. 



JI Bot. Mag. (Tokvo), xiii. (1899) p. 85. See Bot. Centralbl.. lxxxi. (1900) p. 340. 



