YEASTS AND MOULDS. 



143 



(Zygomycetes.) Zygospore formation. 



Both are found in tissue infections. 



I. Phycomycetes. 



1. Mucor corymbifer. 



2. Mucor mucedo. 



3. Other species of Mucor are reported as causing pathologic conditions 

 in man and in lower animals. Some are the cause of fatal infectious dis- 

 eases in such household pests as the common fly. Others attack fruits, 

 as pears, figs in particular, leather goods as gloves, etc. 



Fig. 64. — Saccharomyces cerevisece. The form or variety known as brewers' top yeast. 



{Oberhef.) 



II. Ascomycetes. Spores formed in asci (sacs). 

 I. Saccharomycetes — ^yeasts proper. 



a. Saccharomyces cerevisece. This name is applied to many species 

 or varieties of yeasts concerned in fermentation processes, as in 

 beer, wine and sakd making. 



b. Saccharomyces angina. Pathogenic. 



c. Saccharomyces ellipsoides. Common in fermenting fruits, jams, 

 jellies, fruit juices, etc. Other species are active in various 

 vegetable food fermentations. 



d. Saccharomyces blanchardi. Pathogenic. 



e. Endomyces albicans. Pathogenic, causes thrush. 



