ied ae TWENTY-FIFTH REPORT ON THE STATE MUSEUM. 
above, convex below. The purplish tint, when present, is more 
conspicuous on the under surface of the leaf. 
30. P. Watpsreinta Curt. Dry-strawberry 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. owe. 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 trom the labeling of Dr. Howe’s specimens. 
31. P. Potyconorum Lk. 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, .0015'-.0018’ long, .0006’ broad; peduncle 
colored, very short. 
Leaves of various species of knotgrass, Polygonum amphibium, 
P. Pennsylvanicum and P. Virginianum. Buttalo. Clinton. 
New Baltimore. Howe. 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. Zrichobasis Polygonorum 
Lev. is the Uredo form. 
32. P. Convoryvunr B. & 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-.001’ broad; peduncle colored, thick, about half as 
long as the spore. 
Leaves and stems of the wild morning-glory, Calystegia 
sepium. Common. October and November. 
The sori frequently oceupy the whole under surface of the leaf 
and before the epidermis is ruptured havea 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. I 
cannot distinguish the Uredo form of this species from that of the 
preceding one. 
