141 



both the saltant and the original to the same plate so that they may have 

 the same environmental conditions, the identical quantity and quality of 

 agar, and by growing close together may render comparison easy. Notes 

 on the origin and subsequent behavior of the saltants were made under the 

 eerial number, ard the transfers were designated by additional numbers 

 Thus, IVI98-7 refers to saltant No. 98, transfer 7. 



CHARACTERS OF SALTANTS AS SHOWN IN TRANSFERS 



General appearance. The colonies of the saltant and of the original 

 when grown on the same plate were usually so strikingly different in gen- 

 eral appearance (Fl. XXII, XXIII) that a mere glance sufficed to give 

 the impression that they were colonies of two different species. This dif- 

 ference in general appearance is, on analysis, referable to one or more of 

 the individual differences mentioned below. 



Pate cf linear growth. Frequently the saltant was of much slower 

 growth than the original, resulting in an M colony of much less diameter 

 than that of the O colony, being often less than half of it (see two ex- 

 amples: one given in Fl. XXII and one in PI. XXIII). In some instances, 

 however, the M colony grew faster than the O colony. 



Ccnidial production. Frequently the M colony, especially when slow- 

 growing, was much more productive of conidia than the O colony, so much 

 so as to give the colony a decidedly perceptible darker color. In several 

 instances, however, the M colony was of the opposite character, producing 

 few conidia or, in some cases, going to the extreme of appearing to pro- 

 duce none at all. Generally speaking, rate of linear growth was in inverse 

 ratio to that of conidia-production ; while those saltants that were pale and 

 possessed much aerial mycelium were usually of rapid linear growth and 

 low conidial production. 



Ccnidial clusters. Some saltants varied strikingly from each other 

 and from the originals in the mean number of conidia borne per conidio- 

 phore. 



Ccnidial length, breadth, septation, and shape. These characters, as 

 evidenced by casual observation or by a study of graphs and the data 

 derived from them, are shown to be strikingly different in various saltants. 

 For clearness I present in this connection records concerning only a few 

 saltants, giving graphs and data for others later. 



Graphs of ccnidial length of saltants M35, M36, and M40, those which 

 show greatest deviation from originals in this regard, are given in Fig. P 

 with the essential data. It is to be observed that the modes of M35 and 



