194 IJlinois Siafe Lahorntonj of Natural History. 



uredospores subglobose or oval, sharply ecliinulate, 18-22 by 

 21-27 /It; teleutospores clavate or elavate-obovate, constricted, 

 apex more or less strongly thickened, truncate, obtuse or vari- 

 ously pointed, narrowed below to the rather thick pedicel, 

 smooth, wall rather thin, 12-21 by 33-54 fx; pedicel somewhat 

 colored, short, half the length of the spore. 



Opaque, spadiceous, depressed, spores oblong-ovate, narrowed into 

 a slender pedicel. — Persoon, Syn. Fung., p. 227. 



On leaves of Polygonum amphihliim: Champaign, July 24; 

 McHenry, Aug. 25, 1291, II., III., Aug. 26, 1314, IL, 1331, 

 2404, II., III.; Lake, Aug. 27, 1344, II., III., 1347, IL; Kane, 

 Aug. 30, 1371: Cook, Sept. 5, 1439; Lee, Sept. 9,5758, IL, III.; 

 Stephenson, Sept. 13, 5800, II. . IIL, Sept. 21, (3062, IL, III., 

 6063, IL, IIL; LaSalle, Sept. 16, 1560, Sept. 19, 1593, Sept. 28, 

 6224, IL, IIL; JoDaviess, Sept. 20, 6013, IL, IIL, 6014, IL, 

 ILL; Ogle, Sept. 22, 6111, IL, IIL; Henry, Sept. 28, 1703, IL, 

 IIL; Fulton, Oct. 1, 1788. P. Viry'nuaniiin : Rock Island, 

 Sept. 26; Adams, July 14, coll. C. A. Hart. 



The pedicels of the uredospores are long, and appear in the 

 sori of both states like paraphyses, but the teleutosorus not fol- 

 lowing in a uredo sorus has none of them. 



There is some question about the identity of the Piiccinia 

 on Polygonum Mrginianuiu. The sori are similar, but the te- 

 leutospores are more irregular in shape, the apex more com- 

 monly truncate, the epispore thinner, and the cell contents of 

 different appearance. But there does not seem to be sufficient 

 reason to separate this as a species or even named variety, 



Uredoforms have been collected on Polygonum acre and P. 

 Pemisylvanicuni, without, however, the teleutoform. On the 

 former host the appearance is much like those described, but 

 on the latter the pedicels of the spores are stronger and more 

 persistent. 



P. aletridis, B. & C. 



IL, III. Amphigenous. Sori rather small, scattered, often 

 very numerous; uredosori somewhat prominent, powdery, cin- 

 namon-brown, teleutosori little raised, long covered by the epi- 

 dermis, blackish; uredospores subglobose or oval, sharply ecliin- 

 ulate, wall thick, 18-24 by 21-27 /*; teleutospores clavate, ob- 



