118 
Palaeontologie. — Pflanzenkrankheilen. 
IV. Sclerophylla (Hartblättrige). Blätter gross, wedel- oder fä¬ 
cherartig, meist hart; ihre Äderung selten netzförmig. Stämme 
meist einfach. Hierher die Cycadeen und mit ihnen durch die Ben- 
nettiteen verknüpft die monokotylen Palmen. 
V Desmophylla (Bandblättrige). Blätter meist bandartig, paral¬ 
lelnervig. Stämme + reich verzweigt. Als gymnosperme Ausgangs¬ 
gruppe die Cordaiten, an die sich vielleicht ein grosser Teil der 
baumförmigen Monocotyledonen mit bandförmigen Blättern anschliesst 
(PandanaleSj Yuccaceen, Dracaeneen, Agavoideen ).” 
Von den Sphenophyllen sagt Verf.: „Es ist vermutet worden, 
dass Sph. eine Wasserpflanze mit teilweise untergetauchten Blättern 
gewesen sei. Nach andern wäre es ein Schlinggewächs gewesen, 
was wahrscheinlicher ist. (Vom Ref. gesperrt). Gothan. 
Gusson, H. T., A new Tomato Disease. (Journ. of the Board of 
Agriculture. Vol. XV. p. 111 —115. 1908.) 
An account of a Tomato disease in England caused by Septo- 
ria Lycopersici Speg. Notes on spraying experiments are given, from 
which it is shown that the spores are killed by 1 °/ 0 Bordeaux mix- 
ture, but that spraying can only be used to profit during the earliest 
stages of the disease. A. D. Cotton. 
Massee, G., „Die-back” of Peack Shoots. (Bull. Roy. bot. Gard. 
Kew. N°. 7. p. 269—271. with plate. 1908.) 
Describes a disease of young peach shoots caused by the fun- 
gus Naematospora crocea Sacc. The leaf buds expand normally, but 
at the time of flowering the leaves wilt a twin brown and as the 
season advances shrivel and die. The following year the fruit of 
the fungus is developed. Inoculationexperiments were conducted 
with success on the young wood. A. D. Cotton. 
Pethybridge, G. H. and E. H. Bowers. Dry Rot of the Po- 
tato tuber. (Economic Proceedings of the Royal Dublin Society. 
Vol. I. Part 14. p. 547—558. Aug. T908.) 
The main problem before the authors was to determine whether 
Fusarium Solani Sacc. is the primary cause of the Potato disease 
known as Dry Rot (or Winter Rot). 
A summan T of previous work is first given, from which it is 
seen that though many investigators assert the parasitic nature of 
the fungus, others believe that it only follows in the train of Phy¬ 
tophthora infestans. A number of infection experiments were carried 
out with regard to 1) contact of healthy tubers with diseased ones, 
and 2) inoculation of healthy tubers from pure cultures of the fun¬ 
gus. The results clearly demonstrate that F. Solani is a true para- 
site, capable of directly producing the disease in absolutely healthy 
tubers. As the fungus gains entrance exceedingly readily through 
wounds on the surface of the tuber, care should be exercised during 
lifting not to damage the tubers more than necessary. 
Ä. D. Cotton. 
Salmon, E. S., Disease of Seakale. (Gardener’s Chronicle. Vol. 
XLIV. p. 1-2. July 4, 1908.) 
Describes a series of experiments in connection with a Seakale 
