648 SUMMARY OF CURRENT RESEARCHES RELATING TO 



houses, destroying the young plants. The form is fixed and under no 

 condition reverts to the fertile stage. Glycogen was found in great 

 abundance in the filaments composing the web. Metachromatic cor- 

 puscles were absent, though they were developed by placing the hyphte 

 in distilled water. The presence of these bodies in bacteria has been 

 associated with the pathogenic character of the organisms, but this view 

 does not correspond with the author's observations on the "web" 

 fungus. Only when it is non-pathogenic, as in distilled water, are the 

 corpuscles developed. Protoplasmic communication between the cells, 

 and the anastomosing of the filaments are also described. The papers 

 are illustrated by many figures in the text. 



Botrytis citricola sp. n.* ■ — Ugo Brizi publishes a preliminary 

 paper on a disease of oranges and lemons. Reddish spots make their 

 appearance on immature fruits, small at first and then gradually increas- 

 ing till the whole fruit is attacked, its sap destroyed, and a darkened 

 mummified mass is left. Brizi found the mycelium of a fungus, and by 

 careful culture methods induced the growth of the conidiophores of a 

 Botrytis which he found was a new species and named it B. citricola. 

 He got no other form of the fungus and he concluded that the myce- 

 lium hibernated in the mummified fruits. The fruits attacked had all 

 a characteristic odour. 



Development of Ramularia sequivoca.f ■ — Pietro Voglino has 

 followed the growth of this fungus which appeared on the under side of 

 the leaves of Ranunculus acris along with Erysiphe communis. He 

 kept the leaves for some time and there grew on the infected ones, 

 perithecia of StigmaUa Ranunculi Fries. By repeated, persistent cultures 

 he developed the same perithecia from the spores of Ramularia wquivoca, 

 thus proving the latter to be the conidial form of the higher fungus. 

 Voglino demonstrates the similarity between R. cequivoca (Ces.) Sacc. 

 and R. yibba Fuck. The latter must be considered a synonym of the 

 older species. 



Rusts of Cereals. J— Em. Marchal writes a lengthy report on Puccinia 

 Graminis, P. triticina, P. dispersa, P. glumarum, P. simplex, and P. 

 coronifera, the members of the rust family that attack one or other of 

 the cereal crops. Inquiries have been made throughout the provinces as 

 to the occurrence of these fungi, and the information elicited is tabu- 

 lated and printed. Marchal discusses also the various factors that in- 

 fluence the spread of the rusts, such as weather, soil, manure, &c, and 

 advises as to the best means of combating the disease. 



i & 



Experiments with Puccinise.§ — Ernst Jacky has taken advantage of 

 a supply of the chrysanthemum Uredine to make infection experiments 

 on 0. chinense and C. indicum. A Puccinia on former plants had been 

 named by P. Hennings P. Ghrysanthemi chinensis, but Jacky finds that 

 it is identical morphologically and biologically with an earlier species 

 P. Chrysanthemi Roze. It occurs in Japan, Europe, and North America. 



* Atti R. Accad. Lincei, xii. (1903) pp. 318-24. 



t Malpighia, xvii. (1903) pp. 16-22 (4 figs.). 



% 'Recherches sur la Rouille des Cere'ales,' Bruxelles, 1903, 40 pp. 



§ Centralbl. Bakt., x. (1903) pp. 3G9-S1 (8 figs.). 



