13 



H. doronicoides, H. ntrumosus, H. decapetahts, H. tuberostts, Heli- 

 anthella Parryi, Verbesina encelioidesj Actinomeris squarrosa, 

 Helenium autumnal^, Gaillardia aristata, Dysodia chrysanthe- 

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

 discolor, Cnicus undulatus, G. undulatus var. canescens, G. altissi- 

 mus, G. altissimus var. discolor, Hieraciiim Canadense, Prenanthes 

 alba, Lactuca pulchella, Asclepias variegata, HydropTiyllum Vir- 

 ginicum, H. Ganadense, Phacelia circinata, P. Menziesii, Phlox 

 paniculata, P- Drummondii, Gynoglossum, E chinospermum Vir- 

 ginicum, E. RedowsMi, Mertensia Sibirica, Lithospermum arvense, 

 Mimulus luteus, Tecoma radicans, Verbena officinalis, V. urticw- 

 folia, V. angustifolia, V. hastata, V. stricta, V. bracteosa, Plantago 

 major, Galium Aparine, Uumulus Lupulus, Pilea pumila, Parie- 

 taria debilis, P Pennsylvanica. 



This exceedinglj' common 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. Unusual variations seem to occur in the Rocky Mountain 

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

 'instance, a form on Bigelovia graveolens has 20-30 asci, many of 

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

 short and almost hyaline. Taken by itself, it could hardly be admitted 

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

 Gazette, XIV, p. 286), provisionally propose the name E. sepulta for 

 it. But on Bigelovia Douglasii, 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 others. 

 The asci are often as many as 30 in both cases, — a number much 

 greater than commonly given for typical E. Cichoracearum. On 

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

 only 4-8, but in some collections east of the Mississippi river, reaching 

 20, with apparently no way of distinguishing different species among 

 the varialile 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 they are un- 

 doubtedly allied on the host-plants enumerated above. 



E. Gale6psidis, DC. Flore Franc. VI, p. 108. 



Erysiphe lamprocarpa, Lev. in part. 



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



Erysiphe Chdones, Schw. Syn. N. Am. p. 270. 



