Fungi, Bacteria und Pathologie. 545 



Reed, MlNNlE, Two new Ascomycetous Fungi parasitic 

 on Marine Algae. (University of California Publications, 

 Botany. I. Nov. 1902. p. 141 — 164. pis. 15, 16.) 



Two very interesting species of fungi are described; Guignaräia 

 ulvae Reed sp. nov., in the thallus of Viva californica Wille, and G. 

 alaskana Reed sp. nov., in the thalli of Prasiola borcalis Reed sp. nov. 



G. G. Hedgcock. 



Schneider, Albert, Contributions to the biology of 



Rhizobia. (Botanical Gazette. XXXV. 1903. p. 56—58.) 



A previous statement that Rhizobium mutabile is absolutely non- 

 motile is corrected. 1t has been found that in neutral or very slightly 

 alkaline solid beef gelatine or agar the organism is non-motile. As son 

 as the Rhizobia of sweet clover are placed in acid media they become 

 motile. They then have a rapid, jerky, to-and-fro-and rotary motion 

 continuing during the period of active septation. The number of motile 

 forms is proportionate to the acidity of the medium. In acid media the 

 growths are greyish in color. The motile Rhizobia are much smaller 

 and more uniform in size and form. P. Spaulding. 



Spirig, W., Studien über den Diphtheriebacillus. 

 (Zeitschrift für Hygiene. Bd. XLII. p. 420. 1903. Taf. 6 



-8.) 



Bringt Beschreibung von Involutionsformen und eines in den Culturen 

 gewachsenen Luftmycels, nach dem Verf. auf Verwandtschaft des Diph- 

 theriebacillus mit Aktinomyces schliesst. Der Mycelpilz, obwohl angeblich 

 aus den Bacillen gezüchtet, zeigt indessen nicht die mindeste pathogene 

 Fähigkeit. Hugo Fischer (Bonn). 



Thaxter, Roland, New or Peculiar North American 



Hyphomycetes. III. Contributions from the Crypto- 



gamic Laboratory of Harward University. LIV. 



(Botanical Gazette. XXXV. Fe. 1903. p. 153—159. 2 pl.) 



During a visit to Jamaica in 1890 the writer obtained with other 

 fungi, representatives of two peculiar genera of Hyphomycetous fungi. 

 These have been kept constantly in cultivation since and are now described 

 as new genera and species, under the following names: Under Hetero- 

 cephalum n. gen., Heterocephalum aurantiacum n. sp. on düng of toad, 

 Kingston, Jamaica on goat düng, Philippine Islands; under 

 Cephaliophora n. gen., Cephaliophora tropica n. sp., on mongoose düng, 

 Kingston, Jamaica, on ass düng, Liberia, on rat düng, Java, 

 and on mouse düng, China; C. irregularis n. sp. on mouse düng, 

 Porto Rico. G. G. Hedgcock. 



Ward, Marshall H., Further Observations on the 

 Brown Rust of theBromes, Puccinla dispersa [E r i k s s.] 

 and its adaptive parasitism. (Annales mycologici. 

 Bd. I. 1903. p. 132—151.) 



Die Versuche und Beobachtungen, über welche in dieser Arbeit be- 

 richtet wird, wurden ausschliesslich mit den Uredosporen von Puccinia 

 dispersa auf einer grossen Anzahl von Bromus-Arten angestellt. An 

 Exemplaren, die im Garten dicht beisammen wachsend cultivirt wurden, 

 war zunächst beobachtet worden, dass die Empfänglichkeit für eine In- 

 fection durch die Uredo, von einer bestimmten Nährpflanze auf ganz be- 

 stimmte Sectionen und innerhalb derselben meist auf bestimmte, nahe 



Botan. Centralbl. Bd. LCII. 1903. 35 



