JTUNGI IMPERFECTI 



177 



Fungi which can multiply to an unlimited extent by budding in 

 nutritive solutions, and in this way maintain their definite size and 

 shape. The budding takes place only at the ends of the conidia. 

 The wall of the conidium forms at one or at both ends a small wart- 

 like outgrowth, which gradually becomes larger, and is finally 

 separated from its mother-cell as an independent cell, surrounded 

 by a closed cell-wall (Fig. 182 a, 6). 



FIG. 182. Beer-yeast (SaccTiaromt/ces cerevisice) : a-b (x 400); c-/(x 750) ; c a cell in the 

 process of forming spores ; d a cell vyith four ripe spores ; e the spores liberated by the 

 dissolution of the cell-wall: / three germinating spores; g mycelium-like cell-chains. 

 <x 1000: after Em. Chr. Hansen.) 



Under very favourable conditions multiplication occurs so 

 rapidly that the daughter-cells themselves commence to form 

 buds, before they have separated from their mother-cell, with the 

 result that pearl-like chains of cells are produced. When the 

 yeast-cells have only limited nutriment, with an abundant supply 



