74 
Journal of Mycology 
[Vol. 9 
strictly parasitic relation. While by no positive statement main¬ 
tained, it is nevertheless remarked that “perhaps instead of being 
a symbiotic relation, where each is benefitted, it may be a case 
of extreme relation, where the ascomycete is the aggressor and 
receives all the benefit at the expense of the alga.” 
Stereum quercinum, a new species, is according to M. C. 
Potter (Trans. Eng. Arboricult. Soc. 1901-2) the cause of 
Canker of Oak trees, common in the north of England. 
A GOOD BRIEF OUTLINE OF THE INVESTIGATIONS (published 
in Bui. Min. Agr. France) on a New Bacterial Disease of 
the Potato by G. Delacroix, is given in the Experiment Station 
Record, 141365, Dec. 1902. The disease is due to Bacillus solan- 
inicola and it attacks the tomato as well. The characters of the 
disease are described. The conditions for infection seem to be 
a humid Spring which is late and cold followed suddenly by very 
hot, dry weather. 
Beitrag zur Kentniss der Rostpilze, Centralblatt f. Bakt. 
Par. u. Infektionskr. Zweite Abt. 9:796-804, 841-4, 6 u. 15 Dez. 
1902, Ernst Jacky, includes inoculation experiments with Puc- 
cinia bardanse; P. cirsii-lanceolati Schroet. und P. cirsii-eriophori 
Jacky; P. violse (Schum.) DC.; P. helianthi Schw.; and P. 
prenanthis (Pers.) Lindr. Especially to be mentioned is this 
here first experimentally demonstrated fact that the Violet Rust 
is an aut-eu-puccinia; the author also shows that P. helianthi is 
an aut-eu-puccinia — the pycnidia, secidia, uredo, and teleuto- 
spores produced (by sowings of teleutospores from Helianthus 
annuus) on H. annuus, H. cucumerifolius, and H. californicus, 
but the species not able to live on H. tuberosus, H. maximiliani, 
H. multiflorus, H. scaberrimus, and H. rigidus. 
The Mycological articles in Hedwigia, Band XLI, Heft 
6, 1902, are as follows: Fungi S. Paulenses II. a cl. Puttemans 
collecti, von P. Hennings; Battareopsis Artini n. gen., sowie 
andere von Professor Dr. G. Schweinfurth in Aegypten 1901- 
1902 gesammelte Pilze, von P. Hennings; Sceptromyces Opizi 
Corda (Botrytis sceptrum Corda) ist eine Conidienform von 
Aspergillus niger Rob., von C. Engelke; Neue Beobachtungen 
fiber die Vegetations-Eormen des Mutterkornpilzes Claviceps 
purpurea Tulasne, von C. Engelke; Ueber den Artenbegriff von 
Uredo bistortarum DC. in Flore Frangaise Vol. VI S. 76, von 
P. Magnus; and Ueber die richtige Benennung der Hyalospora 
Aspidiotus (Peck) P. Mag., von P. Magnus. 
Ueber Venturia Crataegi n. spec., R. Aderhold, is an 
illustrated article, published in Berichte der Deutschen Botan- 
ischen Gesellschaft, 20:195-200, pi. 9, 23 Apr. 1902. As a 
synonym, is mentioned Venturia chlorospora (Ces.) Karst, p. 
parte. The conidial form is Fusicladium cratsegi Adrh. n. sp. 
