Apr., May, 1883.] 
MILDEWS OF ILLINOIS, 
87 
Sph/Erotileca pannosa (Wallr.) Lev.—On Rosa lucida, Lake View, 
Aug., ’87. Mycelium abundant on cultivated as well as wild Roses. 
Fruiting specimens not common. 
Erysipiie communis (Wallr.) Fr.—On Amphicarpcea monoica , Bluff 
Lake, Oct., ’86; Desman!Iius brachylobus , Bluff Lake, Oct., ’87. Ferithe- 
cia abundant on stems and branches. Fruit generally maturing after the 
leaves have fallen. Ranunculus abortivus , Fish Lake, Oct., ’86. An 
abundance of mycelium was frequently found on young leaves and stems 
of Astragalus Canadensis , which very likely was the conidial stage of this 
species. 
Erysipiie Galeopsidis, DC.—On St achy s palustris , Bluff Lake, 
Oct., ’86. 
Erysipiie Cichoracearum, DC.—On Ambrosia trifida , East. St. 
Louis, Sept., ’86, Lake View, Aug., ’87; Aster cordifolius, Evanston, Aug., 
’88; A. Drummondii , Bluff Lake, Oct., ’86, Lake View. Aug., ’86; A. dif- 
fusus , Indian Lake, Oct., ’87 ; A. ericoides , Fish Lake, Oct., ’87; A. jun- 
ceus , Lake View. Asci very often with three ascospores; A. sagittifolius , 
Bluff Lake, Oct., ’87; Cnicus altissima , Bluff Lake, Oct., ’87; C. altissima , 
var. discolor , Indian Lake, Oct., ’87; Helianthus annuus , Lake View, 
Sept., ’85; II. doronicoides , Fish Lake, Oct., ’87; H. grosseserratus , Bluff 
Lake, Oct., ’86; Cult. II. tuberosns , Cheltenham, Oct., ’85; Pi7ea pumila, 
Bluff Lake, Oct., ’87 ; Solidago Canadensis , Bluff Lake, Oct., ’87; Tecoma 
radicans , Bluff Lake, Oct., '86; Fer&ewa strict a, Cheltenham, Oct., ’85; F 
urticcefolia , Bluff Lake, Oct., ’87; Fernoma Baldwinii , East St. Louis, Oct., 
’86; F. fascicv.lata , Indian Lake, Oct., ’87; Xanthium Canadense , Lake 
View, Oct., ’85, East St. Louis, Oct., ’87. 
Uncinula Ampelopsidis, Fk.—On Ampelopsis quinquefolia , Chel¬ 
tenham, Oct., ’85, Lake View, Sept., 7 86, Bluff Lake, Oct., 7 87 ; cult. Fftis, 
Englewood, Aug.. ’86, East St. Louis, Oct., ’87. An abundance of my¬ 
celium on Fib's cinerea , East St. Louis, somewhat later I found good 
fruiting material on cultivated specimens of the same species in Botanic 
Garden. 
Uncinula circinata, C. & F.—On Acer dasycarpum , Bluff Lake. 
Oct., ? 86, Oct.,’87; very common. Our specimens are amphigenous, in 
some there is an abundance of mycelium on the upper as well as the lower 
surface of the leaf. The lower surface of the leaf is often covered quite 
uniformly with the persistent mycelium; on the upper it appears in 
roundish patches, which are often confluent with age. 
Uncinula geniculata, Gerard (in Bull. Torrey Bot. Club,Vol. IV, 
p. 48). Epiphyllous; mycelium persistent, in roundish spots or some¬ 
times covering the entire upper surface of the leaf, not conspicuous; 
perithecia small, 80—90 p in diameter, opaque, reticulations small, appen¬ 
dages hyaline, roughened, and often geniculate, usually twice as long as 
the diameter of the perithecium; asci 6—8, ovate; pedicels short; ascos¬ 
pores 4—6, usually 6, elliptical or oval, 7—12 x 12—16 p. On Morns rubra , 
Bluff Lake, Oct., ’86, Oct., ’87. 
