30 Annual Report of the State Botanist. 



which are mostly thickened or bulbous at the base; spores globose, 

 colored, .00025 to .0003 in. in diameter. 



Dead branches of maple, Acer rubrum. Manor. September. 



The pulvinate tufts resemble those of Streptothrix atra, but are paler 

 in color. 



Zygodesmus muricatus, E. & E. 



Decaying wood. Lyndonville. May. Fairman. 

 Dematium parasiticum, n. sp. 



[Plate 3. Figs. 14 to 18.] 



Fertile hyphse erect, simple or slightly branched, sej)tate, colored, 

 bearing catenulate spores at their tips and on their sides; spores 

 subelliptical or limoniform, mostly pointed at one or both ends, 

 colored, .0004 to .0005 in. long, ,0002 to .00025 in. broad. 



Parasitic on some Hydnum, apparently H. carbonarium. Rainbow. 

 August. 



The parasite gives a smoky-black hue to the Hydnum. 



Fusicladium destruens, ?i. sp. 



[Plate 3. Figs. 19 to 22.] 



Hyphse rather short, .0008 to .002 in. long, fasciculate, continuous or 

 with one or two septa near the base, colored, forming small olive-green 

 tufts or patches; spores acrogenous, simple or occasionally uniseptate, 

 sometimes slightly catenulate, elliptical or oblong, colored, .0003 to 

 .0008 in. long, .0002 to .0003 broad. Living leaves of oats, Avena 

 sativa. Sevey. July. 



In the affected plants, the apical part of the leaf first shows 

 symptoms of disease. The tissues die and the color changes to 

 rusty-red or dead-brown. This change goes on till the whole leaf 

 is involved. Soon the minute and inconspicuous tufts of the fungus 

 appear. In the southern part of St. Lawrence county, which was 

 visited by the writer the past summer, scarcely a field of oats was free 

 from this disease. So prevalent was it, that the general color of the 

 fields was changed thereby, and it was the opinion of the owners that 

 their oats were " rusting " badly. Upon close examination, however, 

 no "rust" was to be found. In its stead the discoloration of the 

 leaves and the fungus now described appeared. It is, apparently, a 

 very injurious and destructive fungus. The mycelium is pale and 

 provided with numerous conspicuous septa. 



Cercospora granuliformis, E. and H. 

 Living leaves of violets, Viola blanda. Sevey. July. 



