208 Eumycetes. — Pflanzenkrankheiten. 



Quelques nouveautes sont indiquees: Puccinia Acarnae Syd. 

 Typus Maroccaims, P. Withaniae Lar. Typus Maroccanus; Sphaerella 

 Trifolii Karst. Forma Trifolii-tonientosi\ Didymella siiperfliia (Auers.) 

 Sacc. var. Withaniae\ Hendersonia savmentoriim West. Forma Wi- 

 thaniae'^ Marsonia Daphnes (Desm. et Rob.) Sacc. var. Gnidii. 



J. Henriques. 



Schimon, O., Beiträge zur Kenntnis rotgefärbter niede- 

 rer Pilze. (Dissertat. techn. Hochschule. 127 pp, Fig. München 

 1911.) 



Vier rotgefärbte Pilze wurden kultiviert: 



1. Torttla rubra n. sp., in der Wasserreserve einer Brauerei ge- 

 funden; Grünmalz wird rotgefärbt. Die Farbstoff ist wohl Carotin. 



2. Torula sanguinea n. sp., aus einem pasteurisierten Bier aus 

 Bremen gezogen. Beide Arten gehören in die erste Untergruppe 

 der Toriilaceen. 



3. ein Pilz als Verunreinigung einer Gelatinekultur. Scheint der 

 Typus einer neuen Gattung von Sprosspilzen zu sein. 



4. Cephalosporium rubescens n.sp. (il/"«c^<i/fl'cert^), aus Brau wasser. 

 Ameisensäure tötet N^. 2 und 4, also ein Gift, N*^. 3 und 1 



wurden sehr stark gehemmt. Zitronen-, Aepfel- und Bernsteinsäure 

 wurden von N^. 1, 2, 3 abgebaut. Matouschek (Wien). 



Pethybridge, G. H., The Verticillium Disease ofthe Potato. 

 (Sc. Proc. Roy. Dublin Soc. XV. N« 7. p. 63—92. 2 plates. March 1916.) 



The author has submitted the potato disease caused by Verti- 

 cillium albo-atruni Rke & Berth. to an investigation extending over 

 6 years. 



He finds that the mycelium is confined to the wood vessels 

 of the vascular bundles. With the germination of the „seed" the 

 mycelium passes along the vessels into the shoots, though some- 

 times not until the latter have made considerable growth. Hence 

 though potato plants ma}'^ often show the typical Symptoms of Ver- 

 ticilliiim no mycelium will be found in the stem except in the 

 extreme base. In later stages the mycelium may advance up the 

 shoots and be traced in the vessels of the petioles and leaves, 

 though in cases of bud-infection the water conducting tissues be- 

 come so blocked that the plants wither and die. From the base of 

 the shoots the mycelium also passes into the wood vessels of the 

 rhizomes and from these into the new tubers. Pethy bridge's 

 experiments show that contrary to the view held b}'^ Reinke and 

 Berthold, the mycelium even in autumn, penetrates well towards 

 the apical end of the tuber and that during the winter it advances 

 further, a discovery which renders the control of the disease less 

 easy than was formerly thought. 



Curling of the leaf is shown not to be a constant feature of the 

 disease. The fungus results rather in the more or less premature 

 death by desiccation of the plant owing to the choking up of the 

 wood vessels with mycelium. For this reason the author regards it 

 as a type of wilt disease, though the wilting of the foliage is rare, 

 and he suggests that it should be removed from the categor}^ of 

 "Curl" and „Roll" diseases and be regarded as a type characterised 

 by the wood vessels infested by mycelium for which he suggests 

 the term hadromycosis. A. D. Cotton (Kew). 



