30 Thirty-thirt? 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, Erigeron 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. 



Oercospora Caulophylli,^. 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 ihalictroides. Helderberg mountains. July. 



Ramularia Armoracise Fckl. Living leaves of horse radish, Nasturtium 

 Armoracia. Charlton. July, 



Eamularia Celastri, n. 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 Mitellae, n. 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 Dulcamarse, n. sp. Spots indeterminate, yellowish -green; 

 flocci hypophyllous, branched, forming with the spores a soft felty 

 stratum of a violet-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, Solarium 

 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 Niessl. (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 Solan i, Mart. Potatoes. Albany. March. In Eng- 

 land, this fungus is regarded as a great pest. Mr. W. Gr. 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 



