-1^ A Monograph of the Erysiphaceae 



Bary, Beftr. Morph. Phys. PIlz. i: § XIII. 51. 1870. Cooke, 

 Handb. Brit. Fung. 2: 651. ■ 1871 ; Sacc. Syll. Fung, i: 17. 

 1882; Wint. Rabenh. Krypt. Fl. Deutschl. i^ : 32. 1884; Jacz. 

 Bull. I'Herb. Boiss. 4 : 729. 1896 ; Oudem. Rev. Champ. Pays.- 

 Bas. 2 : 95. 1897. 



E. conti Duby, Bot. Gall. 2: 870. 1830; Cast. Cat. PI. 

 Mars. 19 1. 1845. 



Exsicc. : Rab. Fung. Eur. 672, 1521, 2033; Syd. Myc. March! 

 197. 1637; Desmaz. PI. Cr. Fr. ser. i, 266, * ed. 2, ser. i, 815 ; 

 Cooke, Fung. Brit. Exsicc. 98, ed. sec. 286 ; Vize, Fung. Brit. 

 97; Rehm, Ascom. 548; Berk. Brit. Fung. 204; Oudem. Fung. 

 Neerl. Exsicc. 161 ; Roumeg. Fung. Gall. Exsicc. 974; Fckl. 

 Fung. Rhen. 6^2 ; de Thum. Fung, austr. 134; Sacc. Myc. Ven. 

 601 ; Rab. Herb. Myc. ed. 2, 472 ; de Thlim. Myc. univ. 258 ; 

 Kunze, Fung. Select, exsicc. 61, 577; Westend. Herb. Crypt. 

 Belg. 552; Vestergr. Microm. rar. select. 103; Erb. Critt. Ital. 

 ser. 2, 986 (Herb. Mas. Florence); * Krieg. Fung. Saxon. 724; 

 * Wartm. & Schenk, Schvveiz. Krypt. 425. 



Hypophyllous, very rarely epiphyllous ; mycelium arachnoid, 

 effused, evanescent, or very slightly subpersistent in scattered 

 patches ; penthecia densely gregarious to scattered, subglobose, 

 65-1 10 ,u in diameter, cells distinct, 10-20 /i wide, usuafly over 

 1 5 /A appendages well developed, very long, 10-20 times the 

 diameter of the perithecium, 8-20 or more in number, 4-5 a wide, 

 brown paler above, septate, flexuose, assurgent and fasciculate 

 at)ove, flaccid; asci 2-5, usually 4, broadly ovate to subglobose, 

 with or without a st^lk, 50-60 x 36-45 ;/ ; spores 4-8, usually 8, 

 20-24X 10-14 /A 



Hosts.—Cormis alba (3) (263), C. sanguinea. 

 Distribuiion.~Y.^3KOY>^ : Britain, France, Belgium, Netherlands, 



Switzerland, Italy, Germany, Austria-Hungary, Denmark, Sweden, 

 Russia. 



Distinct in the genus in the possession of the always long, 

 well-developed appendages, assurgent and fasciculate above after 

 the manner of some species of Microsphacra. 



E. tortilis is frequently recorded {e. g., by Bessey (40, p. 13), 

 Trelease (366, p. 9), Rose (299)) from the United States on 

 Clematis Virginiana, but the numerous specimens I have seen so 

 named all belong to E. polygoni, and it seems very probable that 



