8S 



British Uredincct- and UstilaginecF. 



however short it may be, there is always one septum 

 developed near its upper end. The tubercles above men- 

 tioned increase rapidly in length, and become the primary 

 spores (Plate VI. Fig. 7). They are filiform bodies, curved 

 in various ways, and measure from 80 to 100^ in length ; in 

 number they vary from four to twelve or more, according 

 to the size of the spores from which they are developed. 

 When all the protoplasm from the promycelium has been 



absorbed into these primary 

 spores, they become cut off from 

 it by septa at their attached 

 ends. If the prom}xelium be 

 so situated that it cannot reach 

 the air, no primary spores are 

 produced. Shortly after their 

 maturity these primary spores 

 conjugate (Plate VI. Fig. 8), or 

 become united b}' transverse 

 bridges, usually in pairs. The 

 primar}- spore is possibly a 



^ig. 7.— Germinating teleuto?pore of ,,,.;nH-rP rrlrrl Qnorc hllf a<; in 

 'ctia tritlci, producing a cluster of V\ma-CairiCa SpOrC, UUC, dS HI 



primary promycelial spores. A conjugated „,.4-:C^;„1 ^,,lfi,rpc thp\7 a rf> nnl" 



pair of promycehal spores producing two cULUJClcll CUlLUlCb Liicy ctlC IIUL 



secondary spores — an unusual circumstance i j ^i • r j_i c 



(ss). A secondary promycelial spore which CXpOSCd tO thlS torCC, thcy ire- 

 has produced a tertiary (^/). (lulasne.) ... ,^, . 



quently germinate in situ, i his 

 they do by a repetition of the oft-described process of 

 protoplasmic migration, with septation of the emptied 

 parts ; the protrusion of a bud-like process into which the 

 protoplasm is emptied, and which becomes a secondary 

 spore. The end of the promycelium, after the primary 

 spores have fallen off, remains tuberculated, showing the 

 points of their attachment. The conjugation of two 

 primary spores cannot be considered a sexual act, in- 

 asmuch as the single spores, which have not been sub- 

 jected to it in any way, germinate as freely, and produce 



Fi 



TilU 



