13 



H. doronicoides, H. tfrumosus, H. decapetalus, //. tuberosus, Heli- 

 anthella Parry!. Verbesina encelioides, Actinomeris tsq war rota. 

 Helen/inn aatnmnale, Gaillardia aristata, Dysodia chryxanthe- 

 moides, Artemisia dracunculoides, A. biennis. A. Ludoviciana, A. 

 discolor, Cnirux undulatus, C. undulatus var. cane&cens, C. alt/'xN/- 

 int(8, C. altissimus var. discolor, Hieracivm Canadense, Prenanthes 

 alba. Lactuca pnJeleUa. Axflcp'm* rariegata, Hydrophyllum Vir- 

 fflnit-uni. H. Canade?ise, Phacelia eir<-hiata. P. Menziesii, Phlox 

 paniculata, P. Drummondii, Cynoglossum, E chinospermum Vn-- 

 ginieum. E . Redowskii, Merten*t<i Sibirica, Liihospermwrn arr?)ix< . 

 Mhnulus htteus, Tecoma radicans, Verbena qffichtalis. V. urtictt- 

 folia, V. angustifolia, V. hastata, V. str'nin. V. bracteosa, Plantago 

 major, Galium Aparine, Hunnilux Lupulus, Pilea pun/Ha. Parie- 

 taria debilis, P. Pennsylvanica. 



This exceedingly conniioii species is abundant in all sections of 

 our country, and is found upon an extraordinary number of widely 

 distinct host-species, as the preceding list shows, though this is un- 

 doubtedly incomplete. Various names have been given to somewhat 

 different forms included herein, but after a careful examination of a 

 large amount of material from widely separated regions, it seems im- 

 possible to admit specific distinctions among even the most divergent 

 forms, rnusual variations seem to occur in the Rockv Mountain 



* 



regions, as Anderson and Kelsey have noticed in Montana. For 

 instance, a form on Bigeloma graveolens has 20-30 asci. many of 

 which have 3-5. and perhaps more, sporidia, and the appendages are 

 short and almost hvaline. Taken bv itself it could liardlv be admitted. 



i/ t 



as belonging to the present species. Ellis A Everhart (Botanical 

 Gazette, XIV. )>. -86). provisionally propose the name E. sepulta for 

 it. But on Bigelovia Unnyldx/i. growing with the preceding, the 

 fungus is in all characteristics the same, except that the sporidia are 

 uniformly 2, in the specimens examined, and so reported by othei>. 

 The asci are often as mauv as 30 in both cases. a number much 



A 



greater than commonly Driven for typical E. Cichoracearum. On 



. > . i 



other host-species the number of asci is exceedingly variable, mostly 

 only 48, but in some collections east of the Mississippi river, reaching 

 20, with apparently no way of distinguishing different species among 

 the variable forms. Those on Bigelovia are indeed further aberrant, 

 but it does not seem wise to separate one or both as specifically dis- 

 tinct, either from each other or from those with which thev are mi- 







doubtedly allied on the host-plants enumerate! 1 above. 



E. Galeopsidis, DC. Flore Franc. VI, p. 108. 



i 



Erysiphe lamprocarpa, I,ev. in part. 



Erysiphe Labiatarum, Chev. Flora Paris, III, p. 380. 



Erysiphe Chelones, Schw. Syn. X. Am. p. 270. 



