Ervsiphe 213 



were unable to find any spores in the asci of penthecia occurring 

 on living host-plants, but by placing leaves bearing penthecia in 

 water, and leaving them in this position for some days under a 

 bell jar, they were able to induce the formation of spores (8 in 

 ^ each ascus). E. graniinis occasionally causes serious damage to 

 forage and cereal crops, especially to wheat. It is stated in the 

 Jour. Roy. Agric. Soc. England, for 1898 (184), that the fungus 

 '' appears to be greatly encouraged in wheat that is growing lux- 



uriantly from an abundance of nitrogenous manure. , , . Sprink- 

 ling with flowers of sulphur may be useful if applied in the early 

 stages of the attack/' Outbreaks of the disease to a serious de- 

 gree have been reported on the continent, occurring especially on 

 winter-sown cereal crops ; sulphur has been employed with suc- 

 cess (see 1 88, 189, 191 and 400). Anderson (4), speaking of the 

 attacks of E, graminis in Montana, U. S. A., says: ''it affects 



chiefly the Poas^ and is especially 

 of our most valued forage grasses." 



tcmiifolia 



Oidijun monilioidcs Desm. is the conidial stage of the present 

 species. 



The record of " E. graminis'' on Circaca Lntetiana in Lamb. 

 Fl. Myc. Belg. 2, 188, is evidently an error for E. pofygoni, 



Burrill (60, p. 15) concludes his description of E. graminis 

 with the following remark : " Anderson says there are sometimes 

 as many as 20 sporidia in an ascus — ^a variation not reported else- 

 w^here.'' I cannot help thinking that *' 20 asci in a perithecium '' 

 was originally intended. 



5. E. TORTiLis (Wallr.) Fr. 



Alphitomorpha tortilis Wallr. Berk Ges. Nat. Freund. Verh. i : 

 35. 1819; Walk-. Fl. Crypt. Germ. 2: 756. 1833. 



A. corni Wallr. Ann. Wett. Ges. 4 : 244. 18 19. 



Erysibe tortilis Lk. Willd. Sp. PI. 6: iii. 1824; Rabenh. 

 Dcutschl. Krypt. Fl. I : 231. 1844 ; Schroet. in Cohn's Kr>^pt. Fl. 

 Schles. 3 : 241. 1893. 



lErjsiphe tortilis Fr. Syst Myc. 3 : 243. 1829; Berk. Sm.- 

 Eng. Fl. 5: 327, 1836; Lev. Ann. sci. nat. ITL 15: 170. //. 

 //. /. JJ. 1 85 1; Tul. Sel. Fung. Carp, i: 213.//. 5./. 8. 

 1 86 1 ; Cooke, Mien Fung, 221. //. 12.^. ^/j, 2^6. 1865 ; de 



