(TSTILAGO. 291 



The spores are smooth-coated and spherical >r elliptical. 9-12/1 

 and S-10yoc broad. Aeeordinu to I'.ivfeld, they -<! minate 

 in two or three days in water, ami produce promycelia with four 

 <ir rive cells; the cells may either bud out direetly and beeonie 

 hyphae, or do so after previous fusion. 



Spores placed in nutritive solutions germinate in about tin 

 days, and prodiire -everal strong sejitate promycelia with spindle- 

 -haped coniilia. The eonidia as a rule germinate direetly into 

 branching hyphae ; fusion of eonidia is not known, and -eeondary 

 eonidia are only rarely formed. The hyphae become septate 

 in their older parts, and produce eonidia in two ways, tir-tly, 

 from hyphae in the solution itself; secondly, from aerial hyphal 

 branches which rise out of the -olution and ^ive off eonidia 

 in a manner similar to mould-funui. 



I'.refeld states that infection takes place by means of tb.- 

 -erminatin-- eonidia. < >nly re.stin---pores are produced on the 

 plant itself, and these retain their capacity fur -ermination 

 for years. 



Ust. Rabenhorstiana Kiihn 1 (U.S. America). This La found 

 on Panicwm miliaceum, /'. ///"/'/// ///, /'. lineare, and /'. sanguinale. 

 It destroys flower-, ears, and upper part of haulms. The spores 

 are In-own and spiny; th>-v -<] minate, but do not produce 

 eonidia. 



Ust. sphaerogena I'.urrill. An American species caus 

 distortion of the sjiikelets nf Panicum ('/// s-///////'. The malforma- 

 tion- resemble those produced on the same ho.-t by Tvli/i>ii*i><>f'iinn 

 lull, tin in, but ilill'er in haviii'4 a roii-h surfaee with short lijid 

 hail-. The spores are five and -erminate ea-ily in water, 

 produi'iii'4 jtromyeelia wliieh give "If eonidia. The eonidia 

 freipieiitly sprout for a time in a yeast-like manner. 



Tin- follnu-iii'j are Anx-rii-an -|"-' 



Ust. diplospora Kll ( K\. (n /'// inguinale. 



Ust. trichophora Lk. On /'-//"'"/;< colinum. 



Ust. setariae K'.iMi. < in /'"///(///;/ .<.>//.////;//, ; pi .ili.iMv idnili-'al \\itli 



/ '. l:<il-,,/(nr.<ti'.linl. 



Ust. panici-leucophaei lli--l'. <>n Pa\ > "m /</, l y, /,./.,/,,, in |;j,, ,],- .1 mcii >. 



Ust. digitariae K/ 'eur- on the Mowers of /' 



( 1 1,'ii/u ,-/>i ) -"n't/i / /ml' , J'. i/liil'i-i' 111 , ninl I', repens, The 

 smooth-walled. 



1 K.llili, 11.,1'ri,,;,,, 



