8 



On lilhe.s C>/nonhitf!. /j*. (jrarile, li. I'ntiiiuJifolimn, h*. divari- 

 catvm var. irrigiimn, li.Jlor/dinii, li. vvd-rrispa, li. cereiiiii. 



Fioiii tlio eastern sealtuaid to Neliraska ( Wehlicr). and Montana 

 (Anderson). In Herkelev's Notices ol' N. A. Fuiijii ((Jrevillea IV, 

 1>. loS) it is said to oeeur -'on jirapes.'" Fi'oin wliat we now know of 

 tlie limitation ol" tlie speeies, tliis is ja'uliaMy ineorreet. 



This is tlie eoninion "a-ooselieriT mildew.'' It lias lieen roferred 

 to >S'. p'lniiona. liut it is snllieientlv distinatiislied by its dense, dai'k- 

 eoloi-ed mveoliuni, wliich is strikingly unlike that of most of the 

 Ei'y»iphea'. 



S. Kpilobii. (Link.) 



JCiysi/'r I'.pilobii. Link. Species I'lp.iit.arniii VI, p. 102. 



PodosphiTnt \,Splui-iotltecit) I'.pihihii, Dc Bary Heitrage Ziir Morpli. und Pliys. A. 

 I'ilzc. Ill, p. 4S. 



Amitliiiienous. Myeelium dense or araehnoid. Peritheeia densely 

 agiiiegated, small 70-80 /i, eell-walls thin with evident retieulatitins: 

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

 simple, slender, G-1 1 times the diameter of the peritliecium. Ascus 

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



On Ej)lh)hiiiiii ulpininii and I'J. voloyntnin, White Mts. (Farlow)- 

 Wisconsin (Davis). Conidiiferous s]iecimens, ]ir()luil)ly of this species, 

 have been collected in Illinois. Ap])arently rare. 



S. Castiij^nei, Lev. 



Synon.: Compare De Candolle Flore Franc. VI, p]). lOfi-lD.s, 

 Wallr. Flora Germanica pp. Tf)3-7(). Halienhorst Deutschl. Ivrypt. 

 Flora T, j). 230 ct sccj. It seems imi)ossilde to separate this sjiecies 

 I'rom others in the numei'ous desci'ijitions by lliese and other authors. 

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

 XV, J). 139. Eri/nip/ie GentnUn' Scliw. N. Am. Fungi )». 2(!!), and 

 EryHiphcfiiscata, B. & C. Grev. IV, [>. lol* belong to this species. 



Mycelium abundant and persistent or sometimes inconspicuous, 

 occurring on eithei" (»r both sides of the leaves. Peritheeia abiuidant. 

 scattei-ed or somewhat aggregated, small, usually aliout 75 it, but 

 varying from fiO-lOi* ji. Texture soft, surface uneven, reticulations 

 very large and irregular, 20-30 ti: a))jien(lages long, stout, usually 

 colored throughout, but sometimes colorless, llexuous, somewhat uneven 

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

 small, elliptical or suborl»icular. Sporidia usually 8, small, about 

 15 n long. 



On Vernonia Novebonicensis, Eritjcron Canadensis, Coreop- 

 sis aurea, C. arisfosa, Bidens f'rondosa, li. connata, E. cernua 



