Sphaerotheca 71 



walled so that the septa and himcn become obliterated; perithecia 

 gregarious, more or less immersed in the persistent mycelium, 

 sub-globose or sometimes slightly irregular in shape, 76-1 10 a in 

 diameter, cells large, at first well-defined, then becoming obscure, 

 variable in size, 10—25 n wide, usually 15-20/i; appendages 

 usually few (or even obsolete), pale brown, short, and tortuous, 

 rarely more numerous, and longer, up to 5 times the diameter of 

 the perithecium ; ascus elliptic-oblong to sub-globose, 70-92, 

 rarely 92-110 x 50—62 ji ; spores 20-25 x 12-15 ii. 



Hosts. — On the berries, and occasionally stems and leaves of 

 wild and cultivated species of Ribcs ; R. ccrcnm (6), R. Cynosbati, 

 R. divaricatniii, var. irrigmun, R. floridammi, R. gracilc ( — ), R. 

 Grossitlaria, R. Hiidsonianum, R. /aa/stir, R. Missoiiricnst', R. pros- 

 train in, R. rotiindifoliinn, R. rubra in. 



Distribution. — North America: United States — Maine (163), 

 New York, Pennsylvania ! New Jersey (53), Ohio ! Michigan, Illi- 

 nois ! Mississippi (361), Wisconsin (97), Missouri ! Iowa ! Dakota ! 

 Nebraska! Montana! Wyoming! Colorado (157) (170). 



Botrytis cupJiorbiac Cast. Supp.'Cat. PI. Mars. 81. 1851. 



Erysiphe {Sphaerotheca) tomcntosa Otth, Mitth. natur. Gesell. 



Bern. 1865: 168. 1866. 



Sphaerotheca tomentosa Otth ; Jacz. Bull. I'Herb. Boiss. 4 : 723. 

 1896; Sacc. Hedwigia, 35: Repert. XXIII. (1S96); Dom. Sacc. 

 Att. Soc. Ven.-Treub. Sci. nat., (17) //. 5- /• ^- 1S96; Sacc. 



Syli. Fung. 14 : 462. 1899. 



Erysiphe gigantasca Sorok. & Thuem ; de Thuem. Myc. univ. 



no. 645. 1S77; Sacc. Syll. Fung, i: 18. 1S82. 



Sphaerotheca gigantasca (Sorok. & Thuem.) Bauml. in Rehm, 

 Ascom. fasc. XXI. n. 1049. 1891; Hedwigia, 30: 261. 1891 ; 

 Schroet.; Cohn's Krypt. Fl. Schles. 3: 232. 1893. 



Albigo tomentosa (Otth) Kuntze, Revis. Gen. Plant. 3- : 442- 



1892. 



Exsicc: de Thuem. Myc. univ. 645* ; Syd. Myc. March. 3462 



(sub ^. Castagnei). 



Plosts.— Euphorbia dulcis, E. helioscopia, E. palustris (20*), E. 



Peplus, E. platyphyUos, E. stricta, E. virgata (164*). 



Distribution.— E^JKQVY. : France, Switzerland, Germany, Aus- 

 tria-Hungary, Denmark, Russia. 



5. niors-uvae is distinct from S. pannosa (with which it has 



