8 



On liihes Cyriosbati, JR. gracile, It. rotundifolium, R. divari' 

 cat u in var. ii'i'tyuum, R.Jlori-dum, H. uva-crispa, I?, cereum. 



From the eastern seaboard to Nebraska (Webber), and Montana 

 (Anderson). In Berkeley's Notices of N. A. Fungi (Grevillea IV, 

 p. 158) it is said to occur ''on grapes." From what we now know of 

 the limitation of the species, this is probably incorrect. 



This is the common "gooseberry mildew." It has been referred 

 to S. pannosa, but it is sufficiently distinguished by its dense, dark- 

 colored mycelium, which is strikingly unlike that of most of the 

 Erysipheoe. 



S. Epilobii, (Link.) 



/'.ryxibe Epilobii, Link. Species Plantarum VI, p. 102. 



Podosph&ra (Sphcerotheca) Epilobii, De Bary Beitrage Zur Morph. und Phys. d. 

 Pilze. Ill, p. 48. 



Amphigenous. Mycelium dense or arachnoid. Perithecia densely 



** */ 



aggregated, small 70-80 /*, cell-walls thin with evident reticulations: 

 appendages not numerous, very distinct, deeply colored, septate, 

 simple, slender, 6-11 times the diameter of the perithecium. Ascus 

 oval, wall medium. Sporidia usually 8, 15-21 p long. 



On Epilobium alpinum and E . coloratum, White Mts. (Farlow): 

 Wisconsin (Davis). Conidiiferous specimens, probably of this species, 

 have been collected in Illinois. Apparently rare. 



S. Castagnei, Lev. 



Synon.: Compare De Candolle Flore Franc. YI, pp. 106-108. 

 Wallr. Flora Gernianica pp. 753-76. Rabenhorst Deutschl. Krypt. 

 Flora I, p. 230 et seq. It seems impossible to separate this species 

 from others in the numerous descriptions by these and other authors. 

 The name, as given above, is found in Ann. Sci. Nat. Ser. Ill, Tome 

 XV, p. 139. Erysiphe Gerardice Schw. N. Am. Fungi p. 269, and 

 Erysiphe fuscata } B. & C. Grey. IV, p. 159 belong to this species. 



Mycelium abundant and persistent or sometimes inconspicuous, 

 occurring on either or both sides of the leaves. Perithecia abundant, 

 scattered or somewhat aggregated, small, usually about 75 //, but 

 varying from 60-100 p.. Texture soft, surface uneven, reticulations 

 very large and irregular, 20-30 //; appendages long, stout, usually 

 colored throughout, but sometimes colorless, flexuous, somewhat uneven 

 in width, more or less interwoven with the mycelium. Ascus rather 

 small, elliptical or suborbicular. Sporidia usually 8, small, about 

 15 fi. long. 



On Vernonia Noveboracensis, Erigeron Canadensis, Coreop* 

 sis <nii'ea, C. aristosa, Bidens frondosa, B. connata, B. cernua 



