462 Algae. — Fungi, Bacteria und Pathologie. 



brought to a standstill and the germlings die. The nuclear 

 ieatures exhibited during tiie division of such parthenogenetic 

 eggs is oi interest. The nuclear membrane very early dis- 

 appears in a way quite foreign to normal eggs. The nucleolus 

 is Said to break up into „chromosomes", and the mitotic figures 

 are most irregulär. Clusters of nuclei may be formed each 

 often containing few, sometimes, Single, chromosomes. 



Normal fertilisation results in doubling the number chro- 

 mosomes to 32, and the antherozoid seems to carry into the 

 egg something that stimulates the differentiation of a centro- 

 some in the latter. It is believed by the author that the cen- 

 trosome, which is at first Single, subsequently divides, and the 

 two ultimately come to lie opposite to each other. At an inter- 

 mediate stage an angular spindle (resembling one described 

 by the present writer for the spore mother cell of Fegatella 

 conica) is present, the spindle fibres making their appearance 

 at points on the periphery of the nucleus not far from each 

 other, and converging upon the mass of chromosomes. 



A further paper, dealing with the biology and physiology 

 of the Dlctyotaceae is promised. J. B. Farmer (London). 



Tendo, K., Investigations on „Isoyake" [Decrease of 



seaweed.] (Journ. of the Imperial Fisheries Bureau. Vol. XII. 



No. 1. p. 1—33. 1903. Japanese.) 

 Yendo, K., „Isoyake" in the Prefecture of Chiba. 



(Journ. of the Imperial Fisheries Bureau. Vol. XII. No. 1. 



p. 34—38. 1903. Japanese.) 

 Yendo, K., Relation between the Current and the 



Distribution of th e Marin e V egetati o n in Tokyo 



Bay. (Journ. of the Imperial Fisheries Bureau. Vol. XII. 



No. 1. p. 39—47. 1903. Japanese.) 



After having referred to topographical features of the localities 

 where „Isoyake", that is the phenomenon of decrease of seaweeds, occurs, 

 chiefly relating to the currents in the water and to the distribution of 

 the algae, the author concludes that the seaweeds are destroyed by a 

 sudden increase of river water owing to the imprudent Clearing of forest- 

 trees. Okamura. 



Yendo, K., On Coccophora Langsdorfli Grev. (The Botanical 

 Magazine Tokyo. Vol. XVIII. No. 214. p. 237— 241. 1904. 

 Japanese.) 



The author finds that the descriptions of Coccophora phyllamphora 

 (Ag.) J. Ag. correspond to a sterile branch and that of C. Langsdorfü 

 to a fertile branch of one and the saine plant. He believes the genus 

 to be more closely related to Sargassum than to any other genus of the 

 Fucaceae. Okamura. 



Davis, Bradley Moore, Fertilization in the Saproleg- 



niales. (Botanical Gazette. Vol. XXXIX. 1905. p.61— 64.) 



Prof. Trow's researches on fertilization in the Saproleg- 



nieae are the occasion of a critical review in which Dr. Davis 



