Cohnia. 17 



manufacture; can also be cultivated on macerations of 

 dates and carrots, and in the juice of the same, and of beet, 

 and has occurred spontaneously in the sap of turnips and 

 in molasses. 



This, the " gomme de sucrerie " of the French, " froschlaich, " 

 or frog-spawn, of the German sugar manufacturers, causes a great loss 

 when it is allowed to take hold. It forms large whitish gelatinous 

 masses, which grow very rapidly ; the gelatine is elastic, almost car- 

 tilaginous, and insoluble in water. It renders acid the originally 

 neutral liquid in which it develops. When a spore germinates, the 

 middle layer of the cell-wall swells up, the spore proper elongates, and 

 divides into two, which separate, and repeat the process. When the 

 development has ceased, certain of the cocci increase in size, thicken 

 their cell-wall, and become changed into spores. TR.] 



IV. COHNIA, Winter: Clathrocystis (Henfrey), Cohn 

 (pro parte). 



Cells roundish, in a simple peripheral layer surrounded 

 by a common gelatine, forming hollow, round or afterwards 

 irregular bladders or ^esicles, which finally are reticulately 

 pierced. Multiplication of the cells by repeated bipartition ; 

 of the families by the protuberance and separation of 

 daughter-families. 



As I comprehend it, Cohn's genus, Clathrocystis, embraces both 

 Algse and Fungi. Since, then, the generic name was first used for an 

 Alga (Cl. (eruginosa, Henfrey), it is advisable to leave it for that 

 species, and to make the species which belongs to the Fungi the type 

 of a new genus, to which I have given the name of Cohnia, in honour 

 of Professor Dr. F. Cohn, of Breslau, who has gained so much dis- 

 tinction in the investigation of the Schizomycetes. 



24. C. roseo-persicina (Kiitzing). 



Protococcus roseo-persicinus, Kiitzing. 

 Pleurococcus r.-p., Rabenhorst ; Cooke, "British 



Freshwater Algae," p. 6. 

 Microhaloa rosea, Kiitzing. 

 Bacterium rubescens, Lankester, p.p. ( Quart. Jour. 



