82 Forty-fifth Report on the State Museum. 



Ustilago Hordei K. & S. 



Heads of barley, Hordeum vulgore. Sevey, St. Lawrence 

 county and McLean, Tompkins county. July. 



Another species of smut, ITstilogo nuda also occurs on barley, 

 but I have seen no specimens of it. It differs from the present 

 species in having less globose spores, with the epispore spiny 

 and the color of the spores in the mass brown instead of black. 



Doassansia Martianoffiana Schroet. 

 Living leaves of pondweed. Near the outlet of Marl pond, 

 Cortland county. July. The water in which the pondweed 

 grew had evaporated and left the plants stretched upon the 

 muddy soil. They were small and apparently dwarfed, and now 

 being deprived of their normal quantity of water is it any won- 

 der that they yielded to the attacks of their parasite ? 



Entyloma Physalidis Wint. 



Living leaves of the viscid ground cherry, Physalis Virgin- 

 iana. Menands. August. 



Peronospora Rubi Rabh. 

 Living leaves of blackberry, Rubus villosus. Cold Spring, 

 Long Island. July. B. D. Hoisted. 



Peronospora obovata Bon. 

 On corn spurry, Spergula orvensis. Liberty, Sullivan county. 

 July. Hoisted. 



Sporotrichum parasiticum n. sp. 



Effused, minute, white; hyphse very slender and delicate, 

 irregularly branched ; spores numerous, minute, elliptical, .00012 

 to .00016 inches long, .00008 broad. 



On excrescences of the black knot, Plowrightio morbosa. 

 Menands. July. 



This fungus forms a thin white coating over the surface of the 

 excrescence. It is often quite conspicuous because of the dark 

 color of the background. It attacks young as well as old black 

 knots, and in the former case it apparently prevents the free for- 

 mation of the perithecia of the black knot, and should therefore 

 be regarded as a useful fungus. It is sometimes accompanied by 

 Trichothecium roseum. 



