Parasitic Fungi of Illinois. 159 



Farlow. and others) that the plant is not generically distinct 

 from Uromyws. This being admitted, a further question comes 

 upon the specific distinction between the American plant on 

 fflnfs and the European one on Pistacea, an allied genus. Ours 

 was published in RaveneFs Fungi Car. Sup. (1855), under the 

 names of Uredo toxicodendri, Berk. & Rav., for the uredoform, 

 and Pileolaria brevipes, Berk. & Rav., for the teleutoform, and 

 the latter name has been commonly used, though the signifi- 

 cance of the specific appellation is unintelligible or incorrect, 

 for the pedicels are conspicuously long. Upon comparing 

 specimens and descriptions of European and American plants, 

 it does not appear that the latter can be maintained as a dis- 

 tinct species, hence the name previously given to the former 

 has here been adopted (Uredo terebinthi, D. C. Flore Franc. 

 |"1815], VI, p. 71). The teleutospores are not at all different, 

 but in the poor specimens at hand of the European uredo- 

 spores, the spiral arrangement of the prominences cannot be so 

 well made out; however, Schroter (Hedwigia XIV. [1875], 

 p. 170) does not find any difference between tliem. Doubtless 

 there is none. 



It is peculiar that a difference of opinion should exist as to 

 which of the forms is the teleutospore. In these specimens the 

 yellowish fragile-stalked form appears alone in the collections 

 of July, in those of August this is well scattered but present, 

 while the thick-walled long-stalked form may be found in sori 

 still mostly covered by the epidermis, and later (October) only 

 this last is found. 



U. hedysari-paniculati, (Schw.) Farlow. 



II., III. Spots yellow or none; sori amphigenous, scat- 

 tered over the whole under surface of the leaf, few above. II. 

 Sori small, yellowish brown, scattered; spores subglobose, 

 echinulate, 18 by 21 p. III. Sori small, compact, soon diffuse 

 and confluent, brown or blackish; spores acute or oval, obtuse, 

 conspicuously papillate, reddish brown, epispore thick, size 18 

 by 21 ft; pedicels broad, slightly colored, slightly curved below, 

 twice the length of the spore. 



Sori minute, but thickly scattered over the whole leaf, innate with 

 the epidermis. Spores long-pediceled, with the pedicels articulate, pel- 



