Additional Hosts and Notes. 
157 
41. Microsphasra quercina, (Schw.) Burrill. (Microsphcera 
extensa , C. & P., Prelim. List.) 
On Quercus alba , L., Quercus macrocarpa , 
Michx. and Quercus palustris , Du Roi. Racine. 
43. Podosph^ra oxYACANTHiE, (DC.) D By. (Podospliaera 
tridactyla, Wall., Prelim. List.) 
On Crataegus tomentosa. L. and Pyrus coronaria , 
L. Racine. Crataegus Oxyacantha , L. (Tracy 
and G-alloway, loc. cit. p. 34.) Rather common 
on the wild crab leaves in 1888, but the peri- 
theeia were much scattered. 
44. Phyllactinia suffulta, (Reb.) Sacc; 
On Alnus incana , Willd., Acer saccharinum, 
Wang., Hamamelis Virginiana , L., Fagus ferru- 
ginea , Ait., Ostrya Virginica , Willd., Xanthoxy- 
lum Americanum , Mill., Betulapapyrifera y Marsh. 
Cornus stolonifera , Michx. and Cary a sp. Racine. 
45. Sphjerotheca castagnei, Lev. 
On Lactuca Floridana , G-aert., Prenanthes alba , 
L., and Pedicular is lanoeolata , Michx. Racine. 
The mildews on Rubus triflorus , Rich., and Agrimonia Eupa- 
toria , L., referred to this species in the Preliminary List would 
now probably be placed in Sphoerotheca humuli , (DC.) Burrill. 
47. The Erysiphe on Clematis is referred to Erysiphe communis 
(Wallr.) Fr. (Erysiphe tortilis , Wall. Prelim. 
List.) 
48. Erysiphe cichoracearum, DC. (Erysiphe lamprocarpa , 
(Wall.) Prelim. List.) 
On Asterpuniceus, L., Aster sagittifolius , Willd., 
Solidago Canadensis , L., Helenium autumnale , L., 
corymbosus , Ait., Ambrosia trijida, L., and 
Phlox divaricata , L. Racine. corymbosus , 
Ait., and Inula Helenium , L. (Tracy and Galloway, 
c^.) 
13—A. & L. 
