138 Thirty-fifth Report ox the State Museum. 



Septoria Cirsii, Niessl. 



Living leaves of Canada thistle, Cirsium arvense. West Albany. 

 June. 

 Septoria .musiva, n. s^j. 



Spots small, numerous, angular, brown, usually obscurely 

 motck^d by minute angular patches of paler color ; perithecia few, 

 epiphyllous, depressed, black or blackish; spores cylindrical, 

 slightly curved, colorless, sometimes obscurely triseptate, -0012' 

 — 0018' long. 



Living leaves of Cottonwood, Populus monilifera. Albany. July. 



This species differs from *S'. Populi, Desm., in the character of 

 the spots which are variegated like mosaic work, and in the septa- 

 tion of the spores. 

 Phtllosticta Crat^gi, n. S2). 



Spots small, angular or irregular, sometimes confluent, red ; 

 perithecia one to five on a spot, epiphyllous, minute, black; spores 

 broadly elliptical or subglobose, colorless, -0003' long, -00025' 

 broad . 



Living leaves of thorn bushes, CratcBfjus tomeniosa. Albany. 

 July. 

 Phyllosticta variabilis, n. sp. 



Spots small or large, suborbicular or irregular, brown or reddish- 

 brown, the center at length dotted with whitish arid areas or be- 

 coming entirely and, finally falling away; perithecia minute, 

 epiphyllous, black; spores oblong-elliptical, colorless, -0002' — 

 • 0003' long, .0001' — 00012' broad. 



Living leaves of purple-flowered raspberry, Ruhiis odoratus. 

 Albany. September. 

 Protomyces macrosporus, Ung. 



Living leaves and stems of the great ragweed, Ambrosia trifida. 

 Albany. June. 



When this fungus attacks the stems it forms prominent swell- 

 ings which are generally about half an inch long and nearly as 

 broad and of a pale-green color. The spores are globose or sub- 

 globose and vary considerably in size, ranging from '0014:' — 0024' 

 in diameter. They are imbedded in the tissues of the swellings. 

 TJstilago pallida, Sclircst. 



Flowers of wild buckwheat, Polygonum cilinode. 



Three species of smut occur on our knot-weeds. Ustilago 

 iitriculosa is common on Polggonum Pennsylvaniciim, U. Can- 

 dollei is found on P. sagiUahan and U. pallida on P. cilinode. 

 Catskill mountains and Grafton, Rensselaer county. 



