220 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
resemblance was not merely superficial was shown by the production of 
an identical beer. 
Hence the important practical conclusion, that not only microscopical 
examination of the cells, but also the results of first cultivations are 
unsafe guides. 
Morphology and Biology of Oidium albicans.* — MM. G. Linossier 
and G. Koux state that if Oidium albicans be cultivated in an artificial 
medium, within certain limits of temperature, a third undescribed 
sporiferous form will be found to exist. The authors cultivated the 
fungus in a liquid having the following composition per litre : — 
saccharose 20 gr., tartrate of ammonium 10 gr., phosphate of potassium 
1 gr., sulphate of magnesium 0*2 gr., chloride of calcium 0-1 gr., the 
temperature being maintained at from 30-35° C., and were able 
definitely to determine the presence of chlamydospores, and several 
times to verify the absence of true ascopores. They state further that 
in the cultures of this fungus the nature of the form depends on the 
molecular structure of the nourishment. Thus if a small quantity of 
saccharose be present in the liquid short mycelial filaments will be 
found to exist, these filaments becoming longer as the quantity of sugar 
increases. The character of the fungus varies similarly if glycerin or 
mannite be present, or if the nourishment consist only of a simple 
ammoniacal salt. Finally the authors state that if the fungus has been 
cultivated for several generations in a medium where it affects the 
globular-filamentous form, it more easily takes this form when trans- 
ported to new media. 
New Parasite of Agrostis segetum.t — Prof. N. Sorokine describes 
and figures a new parasite which has been met with in the Government of 
Kazan on Agrostis segetum, to which he has assigned the name Soro- 
sporella Agrostidis, the spores somewhat recalling those of Sorosporium, 
although it has nothing in common with the Ustilagineae. M. Giard 
considers Tarichium uvella Krass., parasitic on Agrostis, as identical with 
this new fungus. 
Fungus-parasites. J — Prof. R. Hartig finds that the species of 
Melampsora which attack various species of poplar, M, Tremulse, popu- 
lina, and halsamifera, have their secidio-form in the Cseoma of the 
larch, C. Laricis being identical with the M. populina of the black poplar 
as well as with the M. Tremulee of the aspen. 
He describes also a hitherto unobserved disease of seedling pines 
and firs, which causes great destruction, and which is referable to an un- 
described parasite belonging to the Pyrenomycetes. The mycele enters 
the stomates as well as attacks the wall of the epidermal cells ; the gonids 
resemble those of a Nectria. 
Report of the Chief of the Section of Vegetable Pathology for 
the year 1888, Washington.§ — Mr. B. T. Galloway in this report 
describes and figures the following : — potato-rot (^Phytophthora infestans) ; 
black-rot of the tomato (Macrosporium Solani), also Fusarium Solani and 
Cladosporium fulvum ; brown-rot of cherry {Monilia fructigena) ; powdery 
* Comptes Kendus, cix. (1889) pp. 752-5. 
t Bull. Scient. France et Belg., iv., 1889. See Kev. Mycol., xi. (1889) p. 215. 
i SB. Bot. Ver. Miinchen, Nov. 11, 1889. See Bot. Centralbl., xl. (1889) p. 310. 
§ Rev. Mycol., xi. (1889) pp. 217-8. 
