FRUCTll'lCATlUN UV LUMDIA. 



2 I 



is thert'fi)ri« basifugal <n acropetal. In contmst t» those of tlie 

 first type tla'se .sjiuro exhibit ii rajiiuity jiikI ttMxU'iicy for throw- 

 ing otl" sport's hitenilly us well as from tht' apex, s<j that the 

 operation, when repeated, gives rise to the foriiiation of bninched 

 conidial ehisters. An exeeUent exaniph' of this is furnishe«l by 

 C'/u'lDSjion'mn herbarium, whicli will Ke described iu a later 

 chapter. 



When fust foimed, each conidiuni is unicellular ; and in most 

 fungi it remains so until germination occurs. On the other h.ind, 

 in some species, the interior of the spures becomes divided into 

 compartments by the formation of one or ujore .septa. 



The production of conidia, especially tho.se of the second 

 type, will probably remind the reader of the process referred to 

 as gemmation in § 2 1 9. In fact the sole morpliological difference 



u 



id 



I 



/{ 



{^ 



Kio. 104.— l>lnt;rnnini»tic tkcU-h of the furiiiatlon of conidia, accurtling to type II. 

 Kor explanation see text. {After Xopf.) 



between the two processes is that the one occurs on nii^fative 

 organs and the other on organs of /rnrtiiirnlinn. If this dilTer- 

 ence be obliterated and the mycelium it.self, at a certain periotl 

 of its exi.stencc. beconu-s an organ of fructitication. then the 

 choice of the terms, gi-mmating mycelium or conidial aggregation, 

 for the resulting cells, becomes an arbitrary one. The terra, 

 " yeast conidium," occiuring in the older literature, must be 

 interpreted lu this .sen.so as mostly .applying to budded cells 

 articulated from Ili/fihtniii/retcx, and capable, fiom their method 

 of formation, of being regarded as conidia, as well as re.sem- 

 liling in their (more or le,>^s ovoid) shape the majority of the 

 yeasts. Such forms are found in the J )''iiiafiiii/i jiitlluhins, to be 

 described in the last .section but one. and al.so in many other 

 fungi. 



Little attention has yet been devoted to the relation between 

 the conditions of cultivation and the prtMluction of conidia. 

 According to (J. Ki.khs (I.), in the ca.se of Knrotium {At'jKrtiilhts) 

 repetitt, the motive force is prol>.ibly hyphal tninspinaion ; 



