160 A Monograph of the Erysiphaceae 



Microsphacra Lycii (Lascli.) Sacc. & Roum. Michelia, 2 : 

 310. 1S81; Sacc. Syll. Fung. I : 10. 1882; Wint; Rabenh. 

 Krypt. Fl. Deutschl. 1^:37. 1884; Schroet.; Colm's Krypt. 

 Fl. Schles. 3: 243. 1893; Jacz. Bull. I'Herb. Boiss. 4: 745. 

 1896; Oudem. Rev. Champ. Pays.-Bas. 2 : 89. 1897. 



Exsicc: de Thuem. Fung. Austr. 461 ; Roumeg. Fung. Gall. 



exsicc. 1 165, 2740; Rab. Fung. Eur. 1428; Syd. Myc. March. 

 ZiJ ; de Thucm. Myc. Univ. 2152. 



■ 



Amphigenous ; mycelium thin, effused and subpersistent, or 

 evanescent; perithecia usually epiphyllous, sub-gregarious or 

 scattered, globose-depressed, 1 15-170 /i in diameter, cells obscure, 

 8-13/i wide; appendages very numerous and densely crowded, 

 about equalling the diameter of the perithecium, flaccid, thin- 

 walled throughout, aseptate, smooth, colorless, sometimes slightly 

 nodulose, apex 2-3 times dichotomously branched, or occasion- 

 ally, especially in the branching of the first order, trichotomously 

 divided, branching very loose, irregular, and widely spreading, 

 tips of ultimate branches not recurved ; asci 10-18, ovate or ovate- 

 cylindrical, often somewhat truncate at apex, shortly stalked, 



48-56 X 24-30//.; spores 2, 20-24 X 12-15 /i. 



Hosts.— Lychim barbarum, L. Eiiropacum, L. ovatum (56) (3 19), 

 L. riitlienicHui (307) (394). 



Distribution.— Ya:^qve. : Britain, France, Belgium (44) (209), 

 Netherlands (263), Germany, Italy (307), Austria- Hungary, 

 Russia, (172). 



A very distinct plant, differing from all other species of the 

 genus in the densely crowded, widely branched appendages and 

 the 2-spored asci. 



The appendages at first spread upwards, so that the perithecium, 

 seen from above, appears enveloped in a white mycelium-like mass ; 

 eventually the appendages become reflexed, and the exposed upper 

 half of the perithecium becomes concave. The appendages 

 usually branch at about half their length, and fork widely, measur- 

 mg from 1 00- 1 50 /-/ across the apex. 



tnis name trom ^ orth America proves to be M. diffusa. 



Saccardo and Roumeguere, followed bv all modern authors, 

 uses the name M. Lycii (Lasch.) for the present species. This name, 

 however, published in Sacc. Fung. Gall. ser. III. no. 1174 (1850), 



