178 A Monograph of the Erysiphacece 



Fung. Fenn. Exsicc. 280, 368, 784 ; *Wartm. & Schenk, Schwelz. 

 Krypt. 524, 525,629; Wahrlich. Parasit. Pilz. 28^ 29(10 Herb. 

 Hort Imp. Petropol.); "^Funck, Crypt Gew. Fichtelgeb. 384; 

 *Erikss. Fung. par. scand. 38a, 38b, 148a, 236, 237, 340; 

 *Schmidt & Kunz. Deutschl. Schw. ccxxii.; Seym. & Earle, Econ. 

 Fung. 252; *Kneiff. & Hartm. Fl. Crypt. Bad. 159; *Krieg. 

 Fung. Saxon. 71, 822, 823, 824, 825, 827, 828, 829, 830, 831 ; 

 *Gandog. Fl. Alger, exsicc. 1980, 1983; *E11. & Everh. Fung. 

 Columb. 614; *Cav. Fung. Long, exsicc. 118; Oudem. Fung. 

 Neerl. Exsicc. "jt,, 74, 155, 156, 157, 158; Zopf & Syd. Myc. 

 March. 52; Jack, Lain. & Stizcnb. Krypt. Bad. 631, 632 ; Speg. 

 Dec. Myc. Ital. 84, 84bis ; Klotzsch, Herb. Myc. 61 ;■ and 65 sub 

 E. urticae ; and 1743, 1744 (Herb. Mus. Florence); Berk. Brit. 

 Fung. 200, 201, 203, 269; Baxt. Stirp. Crypt. Oxon. fasc. 2, 97 ; 

 Rab.-Wint. Fung. Eur. 3243 ; Kunze, Fung, select, exsicc. 60 ; 

 Erbar. Critt. Ital. ser. I, 192 (in Herb. Mus. Florence); Linhart, 

 Fung, hungar. 457 (in Iowa State College Herb.) ; Ell. & Everh. 

 N. Amer. Fung. 835, 21 12, sec. ser. 3103. 



Amphigenous ; mycelium very variable, persistent, thin, effused 

 and arachnoid or rarely thick, dense and lichenoid, or more often 

 completely evanescent ; perithecia gregarious to scattered, rarely 

 densely gregarious, usually rather small, about 90 n, but varying 

 from 65-180 //in diameter, cells usually distinct, '10-15 /^ wide, 

 rarely 20 // wide ; appendages veiy variable in number and 'length, 

 sometimes few {z-j), distinct and long (10 times or more the di- 

 ameter of the perithecium), or more rarely few and short, usually 

 numerous and crowded, more or less densely interwoven, and long 

 or short, always spreading horizontally, often interwoven with the 

 mycelium, simple or rarely much branched, and then widely and 

 irregularly forking, sometimes angularly bent, or flexuose-con- 

 torted, colored dark or pale brown at the base or throughout, or 

 quite colorless, rarely becoming shining white, septate when col- 

 ored ; asci usually few, 2-8, rarely as many as 22, variable in 

 shape and size, usually small and ovate, but var>'ing from ovate to 

 broadly ovate or subglobose, with or without a short stalk, 46-72 

 (very rarely reaching to 80 [i) x 30-45 fx ; spores 3-8, usually 

 3-6, very rarely (and never uniformly), only 2, 19-25 X 9-14 /■'• 



Hosts.— Achillea Ptarmica (350), Aconitum Anthora {i^\), A. 



Nap 



vernalis (22), Aegopodhun Podogmria (176) (230) (390), Aethusa 

 Cynapmm, Ajuga reptans (353), Albkzia lophantha, Almis incana. 



