82 A Monograph of the Erysiphaceae 



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1884; Karst. Act. Soc. Faun., FI. Fenn. 2 : 94. 1885; Burr, 

 and Earle, Bull. III. St. Lab. Nat. Hist. 2: 410. '1887; 

 Burr.; Ell. and Everh. N. Amer. Pyren.' 19. pi. 2. 1892; 

 Schroet. ; Cohn's Crypt. Fl. Schles. 3: 245. 1893; Jacz. Bull. 

 I'Herb. Boiss. 4: 742 (syn. excl. partim).- 1896; Oudem. Rev. 

 Champ. Pays-Bas. 87. 1897'. 



' Erysiphe populi Patouill. Journ. de Bot. 2 : 217 (cum icon.). 

 1888; Sacc. Syll. Fung. 9: 370. 1891. 



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Unciniila Cohnnbiana Sclby, Bull. Ohio Agric. Exper. Sta. 

 (Techn. Ser.) i : 221. //. 3. / 5. 1893 ; Sacc. Syll. Fung. 11 : 

 252. 1895. 



U. salicis, var. cpilobii Vestergr. Botan. Notiser, 256. 1897; 

 Sacc. Syll. Fung. 14: 462. 1899. 



Exsicc: Bri. e Cav. Fung. par. 69, 171 ; Fckl. Fung. Rhen. 

 699, *7oo, 2236 ; Cooke, Fung. Brit. Exsicc. *447, ed. 2, 597 ; 

 de Thum. Fung. Austr. 130, 131, 132, 236, 655 ; de Thum.' Myc' 

 univ. 959; Desmaz. PL Cr. Fr. ed. i, ser. i, 268, 2195, *ed. 2, 

 ser. I, 113, 1845; Rehm, Ascom. 549, 550; Rab. Fung. Eur.' 



560, 104s, 23 16, 23 17 ; Rab. Herb. Myc. ed. 2, 464, 465 ; Rab.- 

 Wint. Fung. Eur. 3046 ; Baxt. Stirp. Crypt. Oxon. fasc. 2, 29 ; 

 Karst. Fung. Fenn. 167; Sacc. Myc. Ven. 615. 890; Ellis, N. 

 Amer. Fung. 425 ; Roumeg. Fung. gall, exsicc. 970 ; Syd. Myc. 

 March. %i6, 1657, 2329; Jack, Lein. and Stizenb. Krypt. Bad. 

 630; Westend. Herb. Crypt. Belg. 80; Ellis and Everh. Fung. 

 Columb. 109, *3i4; Ellis and Everh. N. Amer. Fung. 3007; 

 *Wartm. and Schenk, Schweiz. Krypt. 3 20; *Kneiff. and Hartm.' 

 PI. Crypt. Bad. 17 ; *Seym. and Earle, Econ. Fung. 198 ; *Hoppe, 



Fung. Epiphyt. 5, 6, sub 



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Tranz. Fung. Ross. Exsicc. 28 (in Herb. Hort. Imp. Petrop.); 

 *Erikss. Fung. par. scand. 34 ; Schleich, Crypt, exsicc. 77 (in 

 Herb. DC). ^ 



Amphigenous ; mycelium evanescent, or persistent and then 

 usually thm and effused, but sometimes densely compacted and 

 formmg definite circumscribed patches; perithecia densely gre- 

 garious or more or less scattered, globose-depressed or lenticular 

 9C^i75 /^ in diameter, averaging 135 /y., cells 10-15 !'■ wide ; ap- 

 penaages usually numerous, often densely crowded and 100-150, 

 or more, sometimes fewer, rarely only 30-15, 3^-2 1^ times the 

 diameter of the perithecium, simple, aseptate, or occasionally I- 



