ALGOLOGICAL NOTICES 111 



lands under its protection will, like many otlier good things, con- 

 tinue in ever increasing degrees principally to be made in Germany. 



W. P. HiERN. 



Algological Notices. 



In Ni/t McKjauu for XaturvidensJcaherne (Christiania) (Bind 38, 

 Hefte i. 1900) appears a series of short notes by Dr. N. Wille, 

 entitled "Algologische Notizen I. -VI." He introduces these notes 

 by explaining that, during the twenty years and more in which he 

 has paid attention to algse, he has made observations which for 

 some reason or another have remained somewhat fragmentary. 

 These notes he has now decided to publish, since, as he rightly 

 says, they may save trouble to other botanists, or may even incite 

 someone to continue the investigation which from force of circum- 

 stances has been left unfinished by the author. 



The first of the notes is on Chloroijlcea tuhercuhsa (Hansg.), 

 found by Dr. Wille on Laminaria digitata and lihodochorton Rothil. 

 He regards his plant as identical with Pahndhi (/) tuberculosa 

 Hansg., recorded from the Adriatic, and describes both the mode 

 of growth and the formation of akinetes or non-motile reproductive 

 cells. He considers Chloro(/lcea to be one of the Chammiplionacea, 

 allied to Oncobyrsa, and a diagnosis is given of the new genus. 



Note II. describes a new variety — Mandalends — of Merumopedia 

 eUfjans A. Br. It differs from M. elegans var. marina Lagerh., its 

 nearest ally, in the larger size of its colonies, which consist of 

 larger and more irregular cells. 



Asterocystis rauiosa Gobi forms the subject of the third note. 

 Dr. Wille obtained specimens of this alga at Mandal in the 

 summer of 1889, and was able to determine the presence in the 

 cells of a central pvrenoid in a star- shaped chromatophore. From 

 lack of reagents for the staining of nuclei, he was unable to make 

 these bodies visible, though he does not doubt their existence. The 

 manner of cell-division is described, which gives rise in places to the 

 false branching figured by Harvey, and found among families of 

 the Myxophi/cecB. Dr. Wille describes a certain condition of some 

 of the cells, which leads him to suggest the formation of monospores 

 not enclosed in a membrane ; and this suggestion gains weight by 

 a study of the mode of attachment to the plant on which it grows. 

 The development of Asterocystis agrees so closely with that of the 

 genus Goniotrichuin, that it would be possible to unite the two ; but 

 Dr. Wille considers it wiser to retain both genera for the present, as 

 he believes that Asterocystis may prove to have a resting-stage in the 

 form of akinetes. He describes cells which may be these bodies, 

 but the point requires more investigation. A short note on Cruci- 

 genia irregularis Wille adds a few details to the description already 

 published by Dr. Wille on this plant. 



_ Blastophysa arrhiza Wille forms the subject of Note V. The 

 points of difference are enumerated which distinguish this species 

 from B. rhizopus and B. polynwrpha, described by Dr. Kjellman. 

 Although the copulation of zoospores has not been actually observed 



