Ervsiphe 173 



M. euoijwi, also, is related to the present species in the pcni- 

 cillate (though usually shorter) appendages, but differs in the 

 closer and more elaborate branching of the appendages. 



M, Baumlcri has hitherto been recorded only from Germany 

 and Austria, but specimens from the following countries belong 

 here : Scotland, New Pitsligo (specimen in Herb. Berkeley at 

 Kew) ; Italy, Verona (Massalongo, Sept., 1887) ; Russia, Bologov, 

 prov. Novgorod (Tranzschel, Aug., 1897). 



ERYSIPHE Hedw. f. ; DC. (emend. Lev.) Ann. sci. nat. III. 



15 : 161. 1851 



Perithecia globose, or globose-depressed, sometimes becoming 

 concave ; asci several, 2-8-spored. Appendages floccose, simple 

 or irregularly branched (never with a definite apical branching), 

 sometimes obsolete, usually more or less similar to the mycelium 

 and interwoven with it, very rarely {E. tortilis) brown, assurgent 

 and fasciculate. Etym. Eivjat^r^^ robigo. 



Distribution, — Europe, Africa, Asia, Australia, New^ Zealand. 



North America — 8 species and i variety. 



The genus is characterized by the floccose appendages (some- 

 times obsolete or apparently absent), simple or vaguely branched, 

 more or less similar to the hyphae of the mycelium, and frequently 

 interwoven with them. Sphaerothcca is distinguished by the single 

 ascus. E, tortilis has a habit approaching that of some species of 

 Microsphacra — a genus connected on its side with ErysipJic through 



M, astragali. 



Key to tlie Species of Erystphe 



1. Asci (of mature perithecia) not containing spores on the living host-plant. 2. 

 Asci (of mature perithecia) containing spores. 4 



2. Perithecia large, I3S-280 ,a in diameter, averaging 200 ^, more or less immersed 



in the lanuginose persistent mycelium. ^ 4- gramims. 



Perithecia smaller, 80-140 /y, not immersed in a lanuginose mycelium. 3- 



3. galeopsidis, 

 2. cichoracearum. 



5pored. 5- 



3. Haustoria lobed. 

 Haustoria not lobed. 



formly) 3 

 iniformly) 



5. Peiithecia 52-60 /i in diam.; asci 3, 48-50X28-36//- . S. trina, 

 Perithecia 80-240 /z in diara.; asci more than 3, larger. 6. 



6. Perithecia large, becoming pezizoid, 135-240 ^i in diameter, usually about 200 a ; 



asci 7-38, usually about 20, 75-1 'O/^ ^^^^^g- averaging 90 /^> spores 2S-40 /i 

 long, averaging 32 X iS // long. ^' taurica. 



