THE 
AMERICAN NATURALIST 
Vor. XXVII. August, 1893. 320 
THE SPORE-FORMING SPECIES OF THE GENUS 
SACCHAROMYCES. 
J. CHRISTIAN Bay. 
In his monograph on the Sacchai [Saccardo: Sylloge 
Fungorum omnium hucusque cognitorum, Vol. VIII, page 916— 
22.] J. B. de Toni enumerated 31 species of the genus Saccharo- 
myces Meyen upon which the family is based by Reess in the year 
1870, when it was separated from the Ascomycetes. Since DeToni's 
monograph was published, our knowledge of this important 
family, among which very important culture plants are found, 
has been widely broadened, mainly by the investigations of 
Emil Chr. Hansen, so that Pet species may be added to those 
already known. But further De Toni, in his monograph, has 
given no notice to the species described and figured by Hansen, 
nor to the extensive literature based upon these. We find in 
the “ Sylloge ” species as S ideus Reess, S. con- 
glomeratus Reess, S. Pasteurianus Reess, and the description of 
the species is based solely upon the morphology of the cells. 
In fact, for the description not only reliable morphological but 
purely physiological characters of these fungi have been used 
and must to a certain extent be used. Reess and other mycolo- 
gists before Hansen and his school have taken in consideration 
for the description almost solely the morphological characters 
46 
