94 
Mensch- und Tierkrankheiten — Pflanzenkrankheiten 
pratique des entomophytes donne des resultats inconstants, par suite de 
l’influence de nombreux facteurs qui echappent ä notre action. II etudie 
ensuite les caracteres botaniques du Beauveriea Bassiana , et le mode 
special de formation des conidies ä Fextremite des phialides dans ce 
Champignon. II etudie ensuite les autres especes du genre: B. effuso , 
B. densa, B. globulifera, puis le Spicaria farinosa . II conclut en mon- 
trant la necessite de la revision de landen genre Botrytis et en exposant 
les grandes lignes de la Classification des Hypliales de Vuillemin. 
R. Maire (Alger). 
BEAUVERIE, J., Frequence des germes de Rouille dans l’inte- 
rieur des semences de Gramine es (Compt. Rend. Ac. Sc. 1913, 
157, Nr. 18 [3. Nov.], 787—790). 
L auteur a trouve tres frequemment des sores uredrosporiferes et 
teleutosporiferes sur le pericarpe des grains de Ble et sur les glumelles 
adherentes des caryopses vetus. Le mycelium sous-jacent ä ces sores ne 
penetre ni dans l’albumen ni dans l’embryon. L auteur admet que les 
spores ainsi transportees avec les grains doivent jouer un röle important 
dans la propagation des Rouilles. R. Maire (Alger). 
FROMME, F. D., The c ul tu re of cereal Rusts in the greenhouse 
(Bull. Torr. Bot. Club 1913, 40. 501—521). 
The autlior gives a summary of the literature dealing with the con- 
ditions affecting the development of rusts more especially on the problems 
of growing rusts in the greenhouse. The principal recorded observations 
on the influence of various conditions on spore germination and deve¬ 
lopment are tabulated. In Fromme’s own experiments Puccinia dispersa 
on Rye, and P. coronifera on Oats, have been cultured in the uredo stage, 
on the living hosts in the greenhouse, for a consecutive period of six 
months, by the transfer of infection once a month. P. coronifera was 
also cultured for a period of eight months, with transfer of infection once 
a week. Düring this period the rust went through 37 generations of the 
uredo stage. No decrease in the degree of infection secured resulted 
from such continuous culture. The average degree of infection maintained 
in mass cultures was approximately 200 pustules per plant. The largest 
number of pustules counted on an individual plant was 996. P. coronifera 
does not self-propagate to any extent even wlien abundant liost material 
is supplied and a constant humidity of 93% is maintained. High humi¬ 
dity is the essential factor in securing successful inoculation with uredo- 
spores of P. coro7iifera. No infections resulted wlien cultures were ex- 
posed in an atmosphere of 75 to 80% of humidity, and at 93% only 
6% of the normal degree of infection was obtained. Normal infections 
were secured only wlien cultures were covered with a bell-jar for twenty- 
four hours subsequent to the application of spores. The rate of develop¬ 
ment of P. coronifera increased with temperature increase. A decrease 
in the normal incubation period of five days, or 41 % t was produced in 
the “stove 1 ' wliere the temperature ranged from 20 to 30° while the ränge 
at wliicli the normal cultures were grown was 14,5 to 21°. Total light 
exclusion eitlier early or late in the incubation period cliecks the deve¬ 
lopment of P. coro7iifera and results in an almost complete cessation of 
growth. Uredospores of P. coronifera wlien stored at room temperature 
