1893.] Contributions from Missouri Botanical Garden. 691 
round or slightly oval, but often kidney-shaped. Top-vegetation 
scarce. On gelatine a “false” mycelium is often formed. 
8. Saccharomyces exiguus. Hansen. 
Hansen: Annal. d. Microgr. 1888, Nr. 2-3, page 5; 1. c. II, 
page 225.  [Reess, l. c. page 82; PI. II, fig. 7-8, and Hansen, 
l. c. I, page 227. (ex parte)] Saccardo, Sylloge, VIII, page 
917, 1889. Joergensen, l. c. page 136. ong t. c. page 220. 
Winter, Pilze, I, page 70 (ex parte.). 
Probably a distinct species. In beer-wort good development 
and often formation of a * yeast-ring." Cells 2-5», round and 
oval, scarcely long.—Found in press-yeast. Spores rare, top- 
vegetation seldom occurs. No mycelial growth in fluids. 
9. Saccharomyces membranaefaciens. Hansen. 
Hansen: Ann. d. Mier., l. c. page 6; 1. c. II, page 225. Sac- 
cardo, l. c. page 918. Joergensen, l. c. page 137. Ludwig, 1l. 
c. page 220. 
Found on decaying elm-roots. Gives in beer-wort abundant 
top-vegetation of oval cells. Spores easily formed both in cul- 
tures in fluid and in spore-cultures. Gelatine-cultures show 
reddish colonies, the substratum being slowly liquefied. 
10. Saccharomyces Ludwigii. Hansen. 
Hansen, Centralbl. f. Bakteriol. u. Paras. V, page 638, 1889; 
Meddel. III, page 62, 1891. Joergensen, l. c. page 138. Lud- 
wig, l. c. page 218. 
Found in “Schleimfliisse” of oak-trees. Cells elliptical, 
flask-formed, or long and irregular shaped. On gelatine a 
mycelium is developed, with branches and septa. Cultures in 
fluids give spores abundantly. Power of variation great, 
some forms easily giving spores, while others do not. Germina- 
tion of spores peculiar; see Hansen, Medd. III, page 62-70. 
1891 
11. Saccharomyces anomalus. Hansen. 
Hansen, l. c. III, page 71. Ludwig, l. c. page 219. 
In impure yeast from brewery and on grapes. Cells round 
