12 



perithelium, usually fasciculate by irregularly bending near the base, 

 and clustered towards one side, very distinct from the mycelium. Asci 

 3-5 pedicellate. Sporidia 4-6, 22-30 // long. 



On Cornus sanguinea, Missouri (Tracy and Galloway). 



This is here included solely upon the authority given, and appar- 

 ently upon one collection. In Europe the fungus is common on the 

 same host, and as this is abundant in cultivation with us, it is alto- 

 gether probable that this parasite may be frequently found. It is very 

 distinct from those forms of E. communis with long appendages, as on 

 Clematis. These latter have indeed been referred to E. tortilis, 

 evidently by mistake. 



E. Ciclioracearum. DC. Flore Franc. II, p. 274. 



Alphitomorpha communis var. depressa, horridula, Wallr. Verhandl. Naturf. 



Freunde, IV. 

 Alphitomorpha lamprocarpa, Schl. Verhandl. Naturf. Freunde, VII, p. 49. 

 Erysibe communis, lamprocarpa, depressa, horridula, I,k. and Rabh. 

 Erysiphe horridula, Montagnei, lamprocarpa, I,ev., in part 



Erysiphe Ambrosics, Verbence, Phlogis, Asterum, Schweinitz, Syn. N. Am. p. 270. 

 Erysiphe Linkii, L,ev. Ann. Sci. Nat. XV, p. 161. 

 Erysiphe spa dicea, B. & C. Grev. IV, p. 159. 



Amphigenous. Mycelium abundant, persistent, haustoiia rounded, 

 not lobed. Perithecia variable ; appendages numerous, mostly short, 

 1-2 times the diameter of the perithecium, hyaline or mostly colored, 

 much bent and interwoven with the mycelium. Asci variable, mostly 

 numerous, 4 or 5 to 20. Sporidia large, quite uniformly 2, but occa- 

 sionally varying to 3, or even 4 (on Bigelovia 5 or 6). 



On Napcea dioica, Vernonia Noveboracensis, V. fasciculata, 

 V. Baldwinii, Stevia, Eupatorium purpureum, E. perfoliatum, 

 Gutierrezia Euthamice, Grindelia squarrosa, Chrysopsis villosa 7 

 Bigelovia Douglasii, B. graveolens var. albicaulis, Solidago Mis- 

 souriensis, S. serotina, S. Canadensis, S. nana, S. rigida, S. occi- 

 dentalis, Aster conspicuus, A. corymbosus, A. macrophyllus, A. 

 oblongifolius, A. cordifolius, A. sagittifolius, A. Drummondii, A. 

 Imvis, A. ericoides, A. multiflorus, A. viminosus var. foliolosus, A. 

 salicifolius, A. difusus, A. commutatus, A. junceus, A. longifolius, 

 A. foliaceus var. Eatoni, A. umbellatus, A. adscendens, A. ca- 

 nescens, Erigeron Canadensis, E. divaricatus, E. strigosus, E. 

 macranthus, E. glabellus, E. corymbosus, E. armcrimfolius, 

 Inula Helenium, Silphium terebinthinaceUm, Iva frutescens, 1. 

 xanthiifolia, Ambrosia trifida, A. arteniisicefolia, A. psilostachya, 

 Xanthium strumarium, X. Canadense, Eudbeckia occidentalis, 

 Helianthus annuus, H. rigidus, H. grosse-serratus, H. Californicus, 



