Algae. — Fungi, Bacteria und Pathologie. 353 



ments in the two species. In H. gracilis, the filaments of the 

 central Strand are chiefly confined to the main axis and its 

 lateral branches; hence the fruiting filaments emerge in isolated 

 tufts at the angles of a Joint, where the Strand might other- 

 wise have produced new joints. In H. Tuna, the filaments of 

 the central Strand spread fanwise throngh a Joint and the 

 fruiting filaments therefore emerge along the upper margin of 

 a Joint, forming a continuous fringe. In H. gracilis the filament 

 resulting from the fusion of two filaments of the central Strand 

 grows out as a long single filament until it branches into two 

 sporangiophores at its summit; in H. Tuna the filament re- 

 sulting from the fusion branches immediately into two, and 

 each of these long branches again subdivides after a time into 

 two sporangiophores. 



All fresh growth is seen in Halimeda to be preceded by 

 a fusion of filaments of the central Strand, but as this fusion is 

 equally characteristic both of the vegetative and the reproduc- 

 tive growth, the process is not analogous to the fusion of fila- 

 ments in fungi before the formation of spores. The fusion in 

 Halimeda appears to provide a powerful Stimulus for further 

 growth, but the determining factor, whether such growth shall 

 be vegetative or reproductive, is unknown. e. S. Gepp-Barton. 



Philip, R. H., The finding of a famous East Yorkshire 



Diatom. (The Naturalist. July 1904. p. 214—216. Fig. 



in text.) 



The writer gives an account, gathered from letters written by 

 Dr. Walker Arnott of Glasgow of the original discovery of 

 Staurosira (Fragilaria) Harrisonii Peragallo at Hattemprice in 

 Yorkshire. The letters in question were handed to the writer from 

 the papers of the late Mr. Harrison. E. S. Gepp-Barton. 



CROSSLAND, CHARLES, The Fungus Flora of theparishof 

 Halifax. (Halifax 1904. 70 pp. 2 plates.) 



The Fungus Flora of the parish of Halifax has been more tho- 

 roughly worked than any parish in England. The results of years 

 careful searching and collecting are here issued in book form. 



The parish which is 129 Square miles in extent possesses, hüls, 

 Valleys, woods and Moorland, which have proved a rieh hunting 

 ground; four fifths of the surface is on Millstone Grit. 



The book is in the main a list of Fungi with host and habitat, 

 though occasional notes arre added. The total number of species re- 

 corded is 1225, of which 260 are Discotnycetes, a somewhat high percen- 

 tage. Figures of several new species are given. A. D. Cotton. 



Djatschenko, e., Zur Frage über den Erreger dertoxae- 



mischen Haemoglobinurie bei dem Vieh in Kuban 



(Russland). (Centralbl. für Bakt. I. Bd. XXXV. 1904. 



p. 727.) 



Als Erreger der Krankheit beschreibt Verf. ein ziemlich grosses, be- 

 wegliches Spirillum, das aus den Organen eines erkrankten, geschlachteten 



Botan. Centralblatt. ßd. XCVI. 1904. 23 



