52 
Pilzkrankheiten der Pflanzen 
KUSANO, S., On the abnormal thickening and gummosis of the 
basal portion of the Witches’ Broom of Cherry trees 
(MiYABE-Festschrift, Tokio 1911, 117 —126). — [Japanisch.] 
Author has examined abnormal thickening and gummosis of the 
basal portion of the Witches’ Broom of Cherry trees (Prunus Pseudo-Cerasus) 
and found that it is caused by the indirect action of the fungiis whicli gives 
the Stimulation to the host plant. Mother branch cannot keep pace with 
the increased physiological function of the diseased part. J. Hanzawa. 
KUTIN, A., Sclerotinia trifoliorum Erikss. (Rolnikova knihovna 
1913, Nr. 13). — [Böhmisch.] 
Im vergangenen Jahre hat Autor an verschiedenen Orten Böhmens 
die Sclerotinia trifoliorum Erikss., die hauptsächlich die Trifolium -Arten 
befällt und ganze Aussaaten vernichten kann, constatieren können, zuweilen 
in colossaler Verbreitung. Außer an Trifolium fand er sie auch an 
Lotus -Arten (L. corniculatus und L. uliginosus). Jar. Stuchlik (Zürich). 
PEGLION, V., L’Ofiobolo del frumento (Italia Agricola 1913, 50, 578 
—579; 1 tav.). 
Kurzer populärer Artikel über die Fußkrankheit (Ophiobolus) des 
Weizens; die Geschichte der Krankheit und die prophylactischen Maß¬ 
regeln. M. Turconi (Pavia). 
STEWART, A., So me observations on the anatomy and other 
features of the Black knot (Amer. Journ. Bot. 1914, 1, Nr. 3, 
112—125; pls. 2). 
This study concerns itself with the enlargements produced by 
Plowrightia morbosa. The knots arise primarily from the infection by 
spores and secondarily by the spread of the mycelium from knots already 
formed. The multiseriate rays are still further broadened as a result of 
the stimulating action of the fungus. There is an inhibition in the pro- 
duction of the usual xylem elements with a greater production of paren- 
chyma cells in the xylem. These parenchyma cells greatly increase in 
size the year following tlieir formation thus causing the rapid growth of 
the knot. The rate of division of cambial cells is increased on the invaded 
side of the stem. The cambium is normal in position except opposite 
the broad rays where it may be broken up into Segments. These cambial 
Segments may form isolated groups of xylem or scaleriform tracheids in 
place of the normal pitted ones. The outer bark remains unaltered and 
is sloughed off by the emergence of conidia. 
F. A. Wolf (Auburn, Ala.). 
STEVENS, H. E., Citrus- Canker (Florida Agr. Exp. Stat. Bull. 122, 
1914, 113—118; figs. 4). 
Attention is directed in this preliminary report to the occurrence in 
two localities in Florida of a new and serious Citrus disease. The 
Grape fruit seems to be the most severely attacked, leaves, twigs and 
fruits being affected. Citrus trifoliata and the Satsuma Orange are 
also attacked. A brief account is given of the appearance of the disease, 
presumably due to a species of Phyllostida and suggestions for its control 
are made. F. A. Wolf (Auburn, Ala.). 
