11 A Monograph of the Erysiphaceae 



'many of these, however, were the same species on different host 



plants. 



In 1838 Corda (92) figured Erysiphe Pe 

 gofii) and E, bicornis (= Uncmiila accris). 



is p or 1211)1 (= E. p 



t> 



Montagne (109) described 



species from Algeria. 



In 185 I Leveille published in the Ann. Sci. Nat, his classical 

 monograph entitled ''Organisation et Disposition methodique des 

 especes qui composent le genre Erysiphe/' In this work after 

 dividing the -S'^j'i*///^^^^'^^ into two sections, " Sporangium unicum *' 

 and '^ Sporangia plurima," Lev'eille arranged the species in five 

 genera, viz, Podosphaera Kze. and Sphacrotheca Lev. belonging to 

 the first section, and PJiyllactinia Lev., Uncimda Lev., Calodadia 

 Lev. (afterwards changed to Microsphaera (see /. <r,, 381) and 

 Erysiphe Hedw. f. DC. (emend.) belonging to the second. 



These genera, based on characters shown by the appendages, 

 are still found to embrace all the known species of the Erysipha- 

 ceae. For establishing these extremely natural genera, and for 

 the broad view shown in the treatment of species, Leveille's work 

 has long been recognized as of the highest value, 



■ 



In 1 86 1 the brothers Tulasne described fully and illustrated 

 sixteen species of the Erysiphaceae in the first volume of the Selecta 

 Fungorum Carpologia. The five plates, engraved on copper, con- 

 tain the most beautiful illustrations of the family existing, and 

 show well the stages in the life-history of both the conidial and 

 perithecial form. The genera established by Leveille are not 

 kept up, the species all being referred back to the old genus 

 Erysiphe. 



In 1870 De Bary's great work on Erysiphe in the " Beitra^-e 



>gie und Physiologic der Pilze" appeared. Here the 



Morphol 



general life history of the Erysiphaceae^ and especially the history 

 of the development of the perlthecia, were minutely investigated. 

 In a systematic appendix De Bary divided the family into two 

 genera — Podosphaera, with the characters " carpogonia orthotropa. 

 Ascus in quoque perithecio unicus (rarissime, lusu, 2), octosporus ; 

 and Erysiphe, '' carpogonium campylotropum. Asci In quoque 

 perithecio 4 aut plures/' 



In 1872 Cooke and Peck published their papers (90 and 91) on 



