180 
Pathologie 
the disease are described. „As in so many other cases, the largest and 
apparently most robust plants, growing vigorously at a season when damp 
conditions came, were the ones to fall victims, while their less sappy 
companions were free from attack. A method of prevention of this disease 
is thus at once suggested.“ The author thinks that when once the 
disease has appeared prompt spraying with potassium sulphide, together 
with the destruction of the diseased leaves will check its spread. Inci¬ 
dentally it is pointed ont that R. vallisumbrosae Cavara is a prior name 
to R. narcissi Chittenden. 
3. Streak disease of sweet peas. The symptoms and history 
of this disease due to Thielavia basicola are given. It is suggested that 
since this fungus has been found upon such a wide range of plants it is 
not a true parasite. Experiments are described from which it appears 
that the weakening of roots by over-watering laid the plants open to the 
attack of the fungus, which, but for that, would have been harmless. 
J. Ramsbottom (London). 
JAMIESON, C. 0 and WOLLENWEBER, H. W., An external dry rot 
of potato tubers caused by Fusarium trichothecioides 
Wollenw. (Journ. of the Washington Acad, of Science, 1912, II, 
6, 146.) 
An faulenden Kartoffeln wurde ein Fusarium gefunden, das, wie 
Infections versuche zeigten, als Wundparasit zu betrachten ist. Der Pilz 
wird als Fusarium thrichothecioides n. sp. beschrieben und abgebildet. 
Der Pilz hat zweierlei Conidien, eine kleinere Sporenform, also eine Art 
Microconidien, die den Sporen von 7 richothecium sehr ähnlich sind, und 
außerdem Macroconidien, die lachsfarbene Sporodochien bilden. Die 
ersteren sind 1—3 septiert und messen 15—26x4—5% ja, die letzteren 
sind 3—5 septiert und messen 24—42 x 4 y 2 —5% ja. Die ausführliche 
Diagnose ist im Original einzusehen. Riehm (Berlin-Lichterfelde). 
LEWIS, J. M., A black knot-disease of Dianthera americana . 
(Mycologia 1912, 4 , 66 — 70, with Plates 58—61). 
Der Verf. beschreibt eine Krankheit von Dianthera americana, 
die in dem Auftreten hypertrophischer Anschwellungen von 1—3 cm 
Länge an den Internodien besteht und verursacht wird durch einen Pilz, 
der, allerdings mit einigem Zweifel über seine Gattungszugehörigkeit, als 
Bagnisiella Diantherae n. sp. beschrieben wird. Dietel (Zwickau). 
HORNE, A. S., On tumour and canker in potato. [XIII. Contri¬ 
butions from the Wisley Laboratory.] (Journ. Roy. Hort. Soc., 1911, 
37 . 362—389 ; 8 plates.) 
This paper is concerned with the two organisms Chrysophlyctis 
endobiotica (which causes potato tumour) and Spongospora Solani (which 
causes potato canker). The synonomy of each organism is given and the 
english names by which each have been known. A comparative account 
of the symptoms of the two diseases is given and this is illustrated by 
six plates of photographs. The supposed earlier records of Spongospora 
are considered and there appears to be no doubt that Berkeley, Wall- 
roth and Martius were acquainted with the disease but the descriptions 
in each case are imperfect and incomplete. There is also an account of 
