A Fragrant ‘Mycoderma’ Yeast, 
Saccharomyces anomalus (Hansen). 
BY 
B. T. P. BARKER, B.A., 
Gonville and Caius College, Cambridge „ 
With Plate XIII. 
AT the beginning of August 1899, during the course of 
<t\. a series of experiments on the fermentation of ginger, 
a greyish-white floury film was frequently found on the 
surface of saccharose-Mayer solutions 1 to which, after steriliza¬ 
tion, pieces of commercial ginger had been added. Before 
the formation of this film active fermentation had been taking 
place in the liquid, and a slight growth of a species of 
Aspergillus and other organisms had appeared. Towards the 
end of active fermentation the film made its appearance and 
rapidly covered the surface of the liquid : about the same time 
a pleasant fruity odour was apparent, in some cases so strong 
that the whole laboratory was scented with it. The growth 
of the mould was stopped by the development of the film, 
because the latter prevented access of oxygen to the former. 
On examination of a portion of this film under the microscope, 
it was found to be made up of a number of small oval and 
round Yeast-like cells. The organism in its appearance 
1 Pure saccharose 15 grams. Mayer’s Solution 10 c.c, 
[Annals of Botany, Vol. XIV. No. LIV. June, 1900.] 
