206 A Monograph of the Erysiphaceae 



Hosts. — Ballota nigra, Clielone glabra^ Chdonopsis moschata^ 

 Eupatoriiim ageratoidcs [?], Galcopsis Tetrahit^ G, versicolor^ La~ 

 mium allnim^ Z. amplcxicmile (176) (230), L, Galcobdolon^ L, ma- 

 adatiDH^ L, intermediitm^ L. purpureiwi, Leoniirtts Cardiaca^ Mar- 

 riibiiim vulgare^ Phlomis Herba-venti (172), Salvia sp. (176), S. 

 verticillata (3) (290), Scutellaria lateriflora (61), S. parvula (61), 



fr 



{j)(il), Stachys alpina, S. aspera and vars. glabra (324) axidjapoidca, 

 S. ciliata and var. pubcns, S. cordata (324), .S". Gcrinanica, S. uielis- 

 sacfoUa, S. palustris, S. sylvatica, Teiicriiim Canadensc, Verbena 

 nrticifoUa (10). 



Distribution. — Europe : Britain, France, Spanish Peninsula 

 (no), Belgium, Netherlands, Switzerland (176), Italy, Austria- 

 Hungary, Denmark, Norway, Sweden, Russia. 



Asia : Turkestan (Seravschan) (206), Siberia (Minussinsk) 

 (3") (347), Japan. 



North America : United States — Massachusetts, New York, 

 Delaware, Michigan, Indiana, Illinois, Wisconsin, Minnesota, 

 South Dakota, Kansas, Montana, Wyoming, Washington ; Can- 

 ada—Newfoundland, Ontario. 



De Bary (99, p. 49), in 1870, revived the name E. galeopsidis 

 DC. for the Erysiphe on Galcopsis Tetrahit, Stachys sylvatica and 

 Lamium pnrpureinn, distinguishing it from E. lamprocarpa {E. 

 cichoraceariini) described as having " haustoria exappendiculata 

 V. appendiculata, non lobulata," by the presence of "haustoria 

 lobulata." De Bary made the following observations on E. 

 galeopsidis : " Diese Form unterscheidet sich von der vorigen {E. 

 lamprocarpa) durch die gelappten Haustorien-Anhangsel, sie ist 

 sonst der auf Plantago und Borragineen wachsenden lamprocarpa 

 sehr ahnlich. Eine Haupteigenthiimlichkeit, wegen deren ich sie, 

 zur Zeit weingstens, von alien anderen Formen trennen muss, ist 

 die, dass sie nicht wie letztere noch auf dem lebenden Pflanzen- 

 theil Sporen in ihren Ascis bildet, sondern hier immer ohne 

 Sporen vorkommt." 



All subsequent authors have followed De Bary in maintaining 

 E. galeopsidis as a distinct species, and have relied on the lobed 

 haustoria and absence of spores in the ascus as separative char- 

 acters from E. cichoraceanwi. Most authors state that the spores 

 (two in number) are produced in the following year, and that the 



