120 Twenty-fifth Report on the State Museum. 



above, convex below. The purplish tiot, when present, is more 

 conspicuous on tlie under surface of the leaf. 



80. P. Waldsteini^ Gttrt. Dry-strawlerry Brand. 



Habit, spots and sori as in the preceding species ; spores 

 oblong or oblong-clavate, constricted, obtuse, .0016'-.002' long, 

 .0005'-.0006' broad ; peduncle colored, equal to or exceeding the 

 length of the spore. 



Leaves of the dry strawberry, Waldsteinia fragarioides. Fort 

 Edward. Howe. Portville. September. 



In external appearance this species is much like the preceding 

 one, but the spores are smaller and obtuse and the peduncle is 

 longer. I have seen no description of this species and take the 

 name from the labeling of Dr. Howe's specimens. 



31. P. PoLYGONOKUM Z^. Polygonum Brand. 



Spots yellowish, often confluent; sori minute, scattered or clus- 

 tered, sometimes crowded together in a confused manner, blackish- 

 brown or black ; spores obovate or oblong-clavate, generally 

 constricted, obtuse, .0013'-.0018' long, .0006' broad; peduncle 

 colored, very short. 



Leaves of various species of knotgrass, Polygonum- ainjphibium^ 

 P. Pennsylvanicwm and P. Virginianu7n. Bufiklo. Clinton. 

 New Baltimore. Hoim. September and October. 



The sori sometimes occur abundantly on the upper surface of 

 the leaf. The upper cell of the spore is usually shorter than the 

 lower and is sometimes nearly globose. Trichohasis Polygonorum 

 Lev. is the Uredo form. 



32. P. CoNVOLvuLi B. c& C. Morning-glory Brand. 

 Hypogenous ; spots yellow or brownish, sometimes indistinct or 



none ; sori unequal, scattered, for a long time covered by the 

 epidermis, then surrounded by its ruptured remains, black ; spores 

 oblong or oblong-clavate, broad, constricted, obtuse, .0018'-.0022' 

 long, .0008'-.00r broad ; peduncle colored, thick, about half as 

 long as the spore. 



Leaves and stems of the wild morning-glory, Calystegia 

 sepiu7n. Common. October and November. 



The sori frequently occupy the whole under surface of the leaf 

 and before the epidermis is ruptured have a livid hue. I have seen 

 no description of this species, but have specimens from Dr. Curtis, 

 which are labeled with this name and are identical with mine. 1 

 cannot distinguish the Uredo form of this species from that of the 

 preceding one. 



