HANSENIA VALBYENSIS 



275 



We owe to Klocker l a very important study of apiculate yeasts. 

 This author has isolated a series of forms made up of different species 

 which have been described under the name of Saccharomyces apicu- 

 latus. Klocker concluded that this is not a special species but simply 

 a group of species. He has isolated two groups of species which do 

 not sporulate and which he has incorporated in the family of Toru- 

 laceae or Non-Saccharomycetes with the generic name of Pseudosac- 

 charomyces, replacing the genus of Hansenia of Zikes. The sporulat- 

 ing species he has placed in the Saccharomycetes under the name of 

 Hansenia (Lindner), replacing the genus Hanseniaspora of Zikes. 



HANSENIA VALBYENSIS. Klocker 



On beer wort, at 27 C., the cells are apiculate or shaped like 

 ellipsoideus; some are shaped like short sau- 

 sages (5-8 ju). The limits of temperature 

 for growth are 32-33 C. and 0.5 C. The 

 spores appear at the end of from 4 to 5 days 

 on wort gelatin at 25 C. They are hemi- 

 spherical and to the number of two per asc, 



rarely one. It fer- 



ments dextrose, 



levulose and d- 



mannose. Gelatin Fig. 128. Hansenia Val- 



is liquefied It was tyensis. Cells after 3 



found at Copen- (after Klocker). 

 hagen. 



FOURTH GROUP 



Budding yeasts, without copulation in 

 the origin of the asc. These yeasts form 

 a scum on sugar media which is dry and 

 opaque. The ascospores are hemispheri- 

 cal in the form of a lemon supplied with 

 3 a projecting collar and a single thick mem- 



Fig. 129. Hansenia valbyensis. brane. Germination is sometimes pre- 

 ceded by a parthenogamy. The greater 

 part of the species in this group do not 

 give an alcoholic fermentation but do produce ether. 



1, Ascs; 2, Ascospores; 3, Germination 

 of Ascospores according to Klocker. 



1 Klocker, A. Recherches sur les organismens de la fermentation. II. Re- 

 cherches sur 17 formes des Saccharomyces apiculatus. Comp. Rend. Trav. lab. 

 Carlsberg, 1913. 



