Parasitic Fungi of Illinois. 191 



Lean, July 20, 2494, II., 5604, II., Aug. 1, 2493, II., Aug. 0, 

 2495, II.. Oct. 18, 1870, II., Oct.. 19, 1895, II., Stephenson, Sept. 

 21, 0065, II., III. 



The aecidium form is not usually present, but occurs on 

 the same host with II. and III., both of which are abundant. 



The American form differs from the European in having 

 the teleutospores echinulate, and has been called var. Ameri- 

 cana. On Blephilia hirsuta the parasite is plainly different 

 from the type. The sori more frequently have a circular ar- 

 rangement around one evidently older, the epidermis is later 

 rupturing ; and afterwards is less apparent as a border; the 

 spores are much lighter colored, and the epispore is thinner,. 

 This is the uredoform. The teleutospores seem to be rarely 

 developed. 



P. glechomatis, DC. 



III. Hypogenous; spots small, distinct, at first light yel- 

 low, soon becoming blackish and breaking out, leaving more or 

 less circular holes; sori usually closely clustered, often some- 

 what circinating, rarely scattered, ferruginous brown; spores 

 subelliptical, very variable, sometimes obtusely rounded, but 

 often conspicuously pointed above or below, oblong-elliptical, 

 light-colored, 13 by 31 /*; pedicel hyaline, fragile, nearly as 

 long as the spore. 



P. hyssopi, Schw. Spots lutescent, effuse ; sori aggregated, compact, 

 tawny, somewhat circinate and undulately confluent, at first blackish, 

 small, but occurring copiously on the leaves. Spores tawny, becoming 

 loose. Schweinitz, N. Am. Fungi, No. 2944, p. 296. 



Oil leaves of Lophanthus nepetoides: Kane, Aug. 30, 1370, 

 1383; Lee, Sept. 8, 5721; Stephenson, Sept. 13, 5829. 



This is P. glechoince, DC. (Fl. Fr., VI. p. 55), and P. hys- 

 sopi, Schw. 



P. plumbaria, Peck. 



III. Amphigenous. Sori scattered on stems and leaves, 

 small or large, sometimes confluent, covered until late with the 

 more or less fissured and peculiar lead-colored epidermis, when 

 naked dark reddish brown, powdery; spores irregular, broad, 



