FOHMATIUN OF UllJlA AM) GEM.NLt:. 23 



group of fun'.'i Basidioiuycetes. It iuthuleK most of the ediVjle 

 fungi {e.ij. the iiUi>luo«.iii j. 



By introducing into the chissifiuition scheme hiiil down in 

 § 220, the further sulxlivi.sioii based on the peculiarities 

 enunciated above, we obtain tlie following : — 



Cliissitlcation of the Eumycetes. CSoMt. 



/,,./. 1 ( I. Baiiiliotuyettei. 



,/ , 1(a) »!«( /(/)-i/nn<p endogenous I ,. ,. •' 



M i/comijertrs I ' •' ^ * -'2. L rtdtunt. 



(.scj)tiite ■. ' (3. i ttilagxiita, 



mvcelium) Ub) for^nin.j endogeno..8\ 



^ .-pores )^ ' 



EumyctUs. 



Phycomyeeten 



ill'/ zygospores . . 5. Zt/<j<jmt,rftet. 

 iiiy ot •.spores ... 6. Oomycetet. 



(Mseptate \ , ■ ■ '■ • ^ ^ 



' \ spores nor oospores .J ' •' 



The .statement that the formation of endospores i.s peculiar to 

 only a single class of Mijri,iiiiji->.it.-<, the A.-i>iiini-itf.'«, must not, 

 however, be tjilcen to imply that the fungi of this class are ex- 

 clusively reprotlucetl by means of ascospores. On the contrary, 

 emphasis must be given to the fact that the pro<luction of 

 conidia al.><o occurs in the.^e fungi ; hence this da.ss is richer 

 than the other three, as regards methods of fructificjition. 



^ 223.— The formation of Oidia and Gemmae. 



It fretjuently happens that the mycelium proceetis direct to 

 the formation of conidium-like cells, without first pro«lucing 

 conidiophores. In such ca.^es the whole i»r part of the mycelium 

 sulxlivides into short pieces, which are cajiable of .subse<juently 

 germinating and thus playing the part of .sjK:)res. When the 

 mycelium in question belongs to one t>f the Phi/romi/ret'it, it 

 must, for this purpose, prcxluce internally as many tninsverse 

 septa as will corresjx)nd with the number of resting cells to be 

 formed. This constitutes the exceptional ca.se referred to in 

 § 218. where the occurrence of septa in the unicellular my- 

 celium of a Phi/com ycetes can be observed under normal cir- 

 cumstiinces. Special partition walls ai-e also forme«l in such 

 cases in the alre;idy septiitvd mycelimn of the Mt.C"inijctt'f. 

 The formation of germinative resting cells by the breaking up 

 of the mvcelium, was first observed in the cjise of a funmis 

 known as Oidiinii /<j<7/V, which will be more fully considere<l in 

 a later section. The generic name of this fungus is now em- 

 ployed to distinguish the resting cells in question, which ai-e 

 therefore called oidia. Their appejinince is a very oixlinary 

 phenomenon thnnighout the entire realm of the fungi ; and it 

 not infrequently happens that the whole of the mycelium is 

 alYected, and tindergoes conversion into a coherent chain of 

 oidia (Fig. 105). 



