Fungi. (>49 



open being already infected, the „seed" of the grass was 

 sterilised before germination, by steeping in an antiseptic, or 

 by heating to 60 — 70'^ C. Seedlings raised from the iirst under 

 glass, from sterilised „seed" can be grown for two months 

 under proper precautions. 



Seedlings from such antiseptically treated seed were placed 

 in tubes containing cotton-wool saturated with Knop's Solution, 

 and in some instances a continuous current of damp air was 

 drawn trough the tube thus aerating the roots of the seedlings. 

 One result of this continuous aeration was a stunting of the 

 leaves, as compared with other experiments where the aeration 

 was omitted. 



Numerous successfiil infection experiments were carried out 

 on these absolutely pure cultures of seedlings. Finally a series 

 of experiments on seedlings produced as above, was instituted 

 for the purpose of determining the effect on infection and incu- 

 bation, resulting from the lack of any particular ingredient in 

 the soll. A positive result of this was that spores from B. mollis 

 infected B. mollis in the absence of Mg. salts. 



Füll details as to the results of infections, action of diffe- 

 rent coloured light, and influence of absence of various essential 

 soll ingredients, are given in tabular form. G. Massee (Kew). 



Tranzschel, W., Contributiones ad floram myco- 



logicam Rossiae. I. Enumeratio fungorum 



in Tauria a. 1901 lectorum. (Extrait des Travaux du 



Musee botanique de l'Academie imp. des sciences de 



St. Petersbourg. 1902. Livr. 1. p. 1—29 [47—75].) 



In der russisch geschriebenen Arbeit werden 125 Arten Pilze, fast 

 ausschliesslich Parasiten, die Verf. im Süden der Taurischen Halbinsel 

 gesammelt hat, aufgezählt. Neu: Peronospora cristata auf Papaver 

 hybridiiin L. (Oosporen denen von Per. Holostei Casp. am ähnlichsten) 

 und Cercospora taurlca auf Heliotropium europaeum L. var. SteveniaiHim 

 Andrz. Ausserdem finden sich Beschreibungen einer Form von Perono- 

 spora Cyparissiae De Bary auf Euphorbia Chamaesyce (mit Oosporen), 

 zweier Formen von Uromyces excavatiis (DG.) Magnus auf Euphorbia 

 glareosa und E. petrophila, von Puccinia PhysospermiPdi^sGr., P. caniioiica 

 Voss? auf Ferula Ferulago, P. bithynica Magnus. — Uromyces Hennonis 

 Magnus ist auf den Parasiten von Euphorbia caudiculosa Boiss. zu be- 

 schränken, während der unter demselben Namen von Magnus be- 

 schriebene Pilz auf E. Peplus zu Uromyces Winteri Wettst. gehört. Zu 

 Aecidiuni Valerianellae Bir. Bern, wird auch Aec. Velenovskyi Bubak ge- 

 zogen. Aecidium Fediae olitoriac Bals. et De Not. ist von Aec. Valeria- 

 neUae dadurch verschieden, dass bei ersterer Art das Mycel nicht die 

 ganze Pflanze durchzieht, sondern nur kleine Gruppen von Aecidien 

 hervorbringt. W. Tranzschel. 



PiERCE, Newton B. , Black Rot of Oranges. (Botanical 

 Gazette. XXXllI. 1902. p. 234.) 



The author publishes a preliminary note on a disease of navel 

 oranges in California due to a new species of Altenaria {Altenaria citri, 

 Ellis and Pierce). A detailed account is to appear later. 



von Schrenk. 



