Pilzkrankkeiten der Pflanzen 
35 
and 34 of E. gyrosa from Quer eus spp., Liquidambar, Fagus and Castanea 
dentata of America. 
Sterile Chestnut twigs, Raulins fluid. Potato cylinders, Chestnut-twig 
agar, beef agar, Prune agar, corn meal agar, Potato agar, starch, oatmeal. 
Rice and white corn meal were used as culture media. 
Tests as to the influence of light, moisture and temperature on the 
different species were also carried out. All behaved the same in light 
and darkness, growing about equally well in either, and produced pycnidia 
and spores most abundantly in the less saturated media. 8 to 9° C is 
the least temperature at which any of these species will grow, while the 
highest is 35° C for E. parasitica and E. gyrosa and 32° for E. radicalis. 
The best temperature for all lay between 18 and 28° C. 
Potato agar and corn meal proved the best media for producing 
constant and easily recognized characters, of which the most distinctive 
for E. parasitica is the granular, glistening light orange-colored surface 
growth at the bottom of the Potato agar slants, which usually appears 
within a week. None of the other organisms show this, though E. radicalis 
in very old cultures shows suggestions of it. 
On corn meal E. parasitica was constantly characterized by the 
early prodution of numerous small pycnidia and the lack of distinct color 
changes in the media: with E. radicalis the pycnidia were few and large, 
appearing later, and the media became purple; with E. radicalis missis- 
sippiensis the pycnidia were larger and fewer than in E . parasitica and 
the mycelium was orange-chrome at the end of a week, 
Humphrey (Madison, Wise.)- 
Shear, 0. L., The type of Sphaeria r adical is Sch w. (Phytopath. 
1913, 3, 191-192). 
Verf. untersuchte Originalmaterial von Sphaeria radicalis Schw. und 
fand, daß Endothia virginiana And. et And., von der ebenfalls Original¬ 
material untersucht wurde, mit diesem Pilz übereinstimmt. 
Riehm (Berlin-Dahlen). 
PANTANELLI, E., Su la supposta origine europea del cancro ameri- 
cano del Castagno (Rend. Accad. Lincei 1912, 21, 869—875). 
L auteur a fait une étude comparative des caractères morphologiques 
et culturales, de l’habitat, et du parasitisme des deux champignos: Dia- 
porthe parasitica Murill et Endothia radicalis (Schw.) Fr. Il arrive 
aux conclusions suivantes: 
Le Diaporthe parasitica Murr, est un Endothia très semblable 
mais non identique à XEndothia radicalis (Schw.) Fr.: pour cela il faut 
le distinguer sous le nom E. parasitica (Murr.) And. 
Xi Endothia radicalis n'est pas un espèce omogène, mais, en Europe, 
il comprend e des formes différentes; aucune d’elles cependant ne peut 
être identifier avec VE. parasitica. Cette espèce ne peut être originaire 
de l'Europe car les aptitudes parasitaires des formes européennes sont 
très faibles tandis que la forme américaine peut attaquer le Châtaignier 
même dans le climat très doux de Rome. M. Turconi (Pavia). 
PETRI, L., Sopra una nuova specie di Endothia y E. pseudo- 
radicalis (Rend. R. Accad. Lincei 1913, 22, 1° sem., 653—658). 
3 * 
