I02 MORPHOLOGY AND LIFE-HISTORY OF YEASTS. 



Of these three families of Gymnou^cew we are, in the present 

 book, concerned with only one, namely the Saccharoinycetes, the 

 Gi/mnomci on the other hand being of no importance so far as 

 we are concerned, whilst the Exoa^ci may be dismissed in a few 

 words. The genera of this last-named family have been divided 

 by R. Sadebeck (IV.) into two groups : the one comprising 

 parasites, the other saprophytes. The action of one representa- 



FiG. 123.— Endomyces decipiens Reess. 



1. A mycelial branch, the lower part of which has developed three asci («), each of 

 them producing four hat-shaped ascospores ; whereas the upper portion has separated 

 into oidia (6). Magn. 320. 



2. A fragment of mycelium entirely converted into oidia. Magn. 120. 



3. A mycelial branch, which has formed oidia (V) at the top, but underneath has 

 developed three chlamydospores {c). Magn. 240. 



4. A mycelial branch with asci («) solely. Magn. 320. 



5. Pair of spores from such an ascus. Magn. 350. (After Brefeld.) 



tive of the former group, namely Tayhrina Pruni (also formeidy 

 known as E.roascu!< Pruni), will probably be familiar to the 

 reader, viz. the malformation produced by this organism in 

 green plums. According to Sadebeck (II.), the ascospores of 

 this fungus, when grown in saccharine nutrient solutions, develop 

 into a budding mycelium which excites weak alcoholic fermenta- 

 tion. A second species of this group, Endomycei! decipienx, 

 abounds in the lamellae of the fruit of Ayaricus {^Armillaria) 



