IT' < IMA. .", I.". 



uredospores, developed from Inn- sporophores, ami art- in 

 this way distinguished from those nf I'm-,-, ruMgo-vera, which 

 are very short. The teleutospores ijerminate in -]nin- after 

 hibernation, t-a<-h cell .Hiving oil' a single germ-tube. 



I'.nth uredospores and t eleiitospores arc injurious to our 

 cereals, wheat, oats, and rye. They may al-o be found mi 

 tin- following species of grasses: .-1 /////.</////// /////. Alopecuinis 

 J///vi.v//x, A i rii, Avena, ////:<. .!///;/<////<//'//(, /'on, 



A>/i-<>i>i/i-<i in . .///'/////"''. /'///:"/'//''""' etc. 

 The disease mav ruin a whole harvest of L, r rain, ami rendei- 



V 



the .straw disagreeable, if not dan-emu-, I'm- -table use (see 

 also ji. S4i. Kemoval nf barberry bushes j> said tn reduee the 

 rust, althou-h many believe that the liarbt-rry is not accessary 

 for the existence of the fungus. 1 1'lowri^ht, for example, found 

 that spnridia fmm teleutospores intV-cted wheat-seedlings 

 without intervention of the aecidiosjuin- stage. Ii is also 

 that the myeelium hiliernates like that of J'n<;-. ,-i/},i,/<i-n , , in 

 some wild grass, to -row auain and j.roduee uredosj.oies in sjirin^. 



No \vry etfeetivc iiieasuivs a-ain-t this fungus are known. 

 Karly sowing has been su--vsted: ami certain varieties of -rain, 

 known to lie less liable to attack" than others, mi-lit be used. 



Kriksson and Ilennin-.-' from the results of their 

 experiments. have ]rovisioiially distinguished the 



: ielil-s of /'. ill-null ill* : 

 . I. I (etildte -(a) dist illi-t \aliet jes : 



1. \'al'. X/V7///.S on ,SMV//C cereale, Jfnli inn ruli/n,;, Tr 



repens, ami y:'////////.s arenaruis. 

 '2. Var. "/< //'/< mi Avena sativa, MiUmn <_////.%// ///, .l 

 pratensis, />"</,///* ijlmm /'/// (and Avena - 



"'. \ ar. ilii-ii' oil A 1 1- nil *i>itn.-l. 



((3) somewhal uncertain vaiieti' 



4. \ ar. '//// .s//< on J///v/^7/\ canina, and ./. Jn 



5. \ ar. fmni on /'..// compressa land /'. j>/-iit,,i 

 //. \< '! -hai ply defined : 



'i. \ ar. ////// on T/'il ii-ii in ruin- 



\n inl 'li-<-iisinn ! t ii en b Wor. G. Smith (^ 



Of < '/"//-, 1 'li:i|i. \ \\ . K.lil. l 



l'liik---n :ui.| llc-iiiiinx'. " I 'iili-i -ii. liiinji n nli. .1. ( ii-l iri'li-i i.-lr, ' /. 

 i I'll',,, iiL-inikli- if. a, Is'M 



