30 THIRTY-THIRED ANNUAL REPORT OF THE 
lowish ; flocci short, minutely tufted, septate; spores slightly thick- 
ened toward one end or subfusiform, colorless, triseptate, .0016 in. 
to .002 in. long. Living leaves of fleabane, ZHrigeron annuum. 
Charlton. July. The tufts are so numerous and so minute as to give 
the spots on the under surface of the leaf the appearance of being suf- 
fused by a minute pruinosity. 
Cercospora Caulophylli,z. sp. Spots irregular or suborbicular, dark- 
brown or grayish with a dark-brown margin; flocci hypophyllous, 
tufted, flexuous, nodulose above, colored, rarely branched; spores oblong 
or cylindrical, with one to three septa, colorless, .0008 in. to .0012 in. 
long, .00025 in. to .0003 in. broad. Living or languishing leaves of 
cohosh, Caulophyllum thalictroides. Helderberg mountains. July. 
Ramularia Armoraciz Fck/. Living leaves of horse radish, Nasturtium 
Armoracia, Charlton. July, 
Ramularia Celastri, 2. sp. Spots small, suborbicular, scattered, brown 
or blackish-brown, generally with a pure-white center on the upper 
surface; flocci hypophyllous, slender, septate, tufted; spores cylindrical, 
nearly straight, colorless, .0006 in. to .001 in. long, about .00015 in. 
broad, Living leaves of bitter sweet, Celastrus scandens. Highland 
Mills, July. 
Ramularia Mitelle, 2. sp. Spots suborbicular, brown; flocci hy- 
pophyllous, minutely tufted, short, nearly straight,slightly colored; spores 
straight, oblong or cylindrical, colorless, unequal in length, .0003 in. 
to .0008 in. long, .00012 in. broad. Living leaves of mitrewort, 
Mitella diphylla. Newburgh and Jamesville. Aug. and Sept. 
Ramularia Dulcamare, ”. sp. Spots indeterminate, yellowish-green; 
flocci hypophyllous, branched, forming with the spores a soft felty 
stratum of aviolet-gray color; spores oblong or subcylindrical, simple 
or containing several nucleoli, colorless, .0008 in. to .0018 in. long, 
.0002 in. to .00025 in. broad. Living leaves of nightshade, Solanum 
Dulcamara. Verona. Aug. The spots are very unequal in size and 
often confluent. When the leaf fades the spots retain for a longer time 
their greenish hue. ‘The species in some respects approaches the genus 
Peronospora. 
Microstroma leucosporum WMiessi. (Plate 1, figs. 14-17.) Living 
leaves of butternut, Juglans cinerea. Charlton. July. It is with some 
hesitation that I refer our plant to this species. According to the figure 
of the European fungus, which occurs on leaves of Juglans regia, the 
spores are more than twice as long as broad and binucleate, while in 
our fungus they are scarcely twice as long as broad and uninucleate. 
Perhaps farther investigation will require its separation as a distinct 
species. It occurs on leaves of young trees. 
Fusisporium Solani, Mart. Potatoes. Albany. March. In Eng- 
land, this fungus is regarded as a great pest. Mr. W. G. Smith writes 
of it and the potato-rot fungus as follows: ‘‘For more than thirty 
years our potato crops have been systematically destroyed by two viru- 
lent fungi, viz., Peronospora infestans and Fusisporium Solani, these 
two parasites almost invariably work in company with each other, 
they suddenly appear for a few weeks, destroy our crops, and vanish 
for ten or twelve months, then reappear and repeat the work of 
destruction. * * * As I have kept the resting-spores of both 
parasites alive artificially in decayed potato leaves in water, in moist 
