292 
Found on leaves of Preenanthes altissima. Rose’s additional notes to 
Cooke’s description of this form do not state that some perithecia contain 
two asci. Such a case was observed in two or three perithecia of this 
species found on an Erigeron. In these unusual forms one ascus was much 
larger than its companion, but not as large as the ascus existing alone in 
a perithecium. A few of these unusual forms might lead to the question- 
ing of what has, heretofore, been considered a strong generic difference 
between a Spheerotheca and an Erysiphe. 
Podospheera oxacantha DC. was found on cherry leaves. This species 
was named Podosphera Kunzei by Dr. Bessey, but the reasons for chang- 
ing to P. oxacantha are detailed in Bot. Gazette, Vol. XI. page 60, 1886. 
Phyllactina suffulta Reb. (P. guttata Léyv.). 
Found sparingly on leaves of a Desmodium. 
Uncinula flexuosa. 
Occurred abundantly on leaves of the buckeye. This is a beautiful 
species and is characterized by wavy outlines of appendages at their 
extremities. It is amphigenous, appendages are hyaline, varying from 
thirty-six to fifty-six in number; asci, seven to twelve; spores, six to ten, 
and strongly pedicellate. 
Uncinula Ampelopsidis Pk. was found in abundance on leaves of 
Ampelopsis quinquefolia. In the Trans. Albany Inst., Vol. VII, page 216, 
Peck includes U. Americana, U. spiralis and U. subfusca under the one 
name of Uncinula Ampelopsidis. 
Uncinula adunca Lévy. 
Found very abundantly on willow leaves. It is amphigenous; has six 
to eight asci, and usually from four to six spores, rarely eight, in our 
species, though Bessey describes it with only four spores. 
Uncinula circinnata C. and P. 
On silver maple leaves. 
Microsphera Ravenelii B. 
On leaves of honey locust. The repeated forking at the apices of the 
appendages makes the determination of this species very easy. It has 
from eight to sixteen appendages; asci, four to nine; spores, six to eight. 
Microsphzera extensa C. and P. 
Found on the upper surface of red oak leaves and on both sides of 
leaves from a young oak; the species was somewhat doubtful. Both speci- 
wens had very long appendages; from four to five asci; four to eight 
