THE FUNGI WHICH CAUSE PLANT DISEASE 569 



M. fructigena Pers. on stone and pome fruits =Sclerotinia 

 fructigena. See p. 139. 



M. cinerea Bon. on stone and pome fruits=Sclerotinia cinerea. 

 See p. 137. 



M. cinerea Bon. on Prunus padus=Sclerotinia padi. See p. 140. 



M. cinerea Bon. on Vacciniimi oxycoccus=Sclerotinia oxycocci. 

 See p. 140. 



M. laxa A. & R. on apricots=Sclerotinia laxa. See p. 137. 



M. linhartiana Sacc. on medlars and quinces " =Sclerotinia 

 linhartiana. See p. 141. 



M. crategi Diedicke on Crataegus =Sclerotinia crategi. See 

 p. 143. 



M. seaveri Reade on Pnmus=Sclerotinia seaveri.*^'' ^^'^ See 

 p. 140. 



M. fimicola Cast. & Matr. is a parasite of mushrooms, Clitocybe 

 and Pleurotus. 



Oidium Link (p. 567) 



On the surface of living leaves; hyphse branched, white, bearing 

 erect, simple conidiophores with catenulate, ovoid conidia. 



About fifty species. 



These conidial fungi in the main belong to the Erysiphales 

 though some forms are placed in Oidium which clearly do not 

 belong to that ascigerous order. Salmon states that there are 

 some forty-four apparently Erysiphaceous Oidiums Hsted; but 

 that twenty-five of these grow on plants known to be the hosts 

 of ascus bearing Erysiphacese. 



O. fragarise Harz.=S. hiimuli. See p. 175. 



O. leucoconium Desm.=S. pannosa. See p. 176. 



O. balsamii Mont.=E. polygoni. See p. 177. 



O. ambrosise Thiim.=E. cichoracearum. See p. 178. 



O. monilioides Link.=E. graminis. See p. 179. 



O. tuckeri Berk.=U. necator. See p. 181. 



O. crataegi Grogn.=P. oxyacanthse. See p. 183. 



O. farinosum Cke.=P. leucotricha. See p. 184. 



The following may also be mentioned: 



O. erysiphoides Fr. on hop, clover, cucumber, etc.; 



O. chrysanthemi Rab. on chrysanthemums; 



