200 Illinois Stale Laboratory of Natural History. 



McHenry, Aug. 22, 1224. Oats: Rye: LaSalle, June 19. 

 5225,11., III. Elymns Virginians: Champaign, Aug. 11. .1022: 

 McHenry, Aug. 24, 1276; Ogle, Sept. 25, 6155, II.. III. 



This name is founded upon the recognition of the uredo- 

 form as Uredo rubigo-vera, DC. (Flore Franc. VI. [1815] p. 83). 

 which to say the least is doubtful. The same name has been 

 used for the uredoform of Pmcinia coronata. and of Pucci-nin 

 graminis, found on the same host species, and doubtless equally 

 included by DeCandolle in his supposed species. Winter 

 (Die Pilze, p. 217) probably had good reasons for accepting 

 the name as here given, but should, for any reason, botanists 

 decline to follow him in this, then Piicciniastriceformis. Westd. 

 (Bull, de 1' Acad. Belg. [1853] XXI.), rather than Pucdnia 

 straminis, Fuckel (Enumer. Fung, in Jahr. Ver. f. Natur v. 

 Nassau [1861, etc.]), should be adopted, though the latter rec- 

 ognizes DeCandolle's Uredo rubigo-vera as the early stage of 

 the teleutoform named by him. Certain it is that P. coronata 

 and P. rubigo-vera are very closely allied. 



P. coronata, Corda. 



II., III. Amphigenous. Uredospores subglobose, echiiiu- 

 late, 18-21 by 21-24 ^; teleutosori small, oblong or linear, 

 slightly raised, surrounded by a dense row of paraphyses, long 

 covered by the epidermis; teleutospores cuneate, scarcely con- 

 stricted at the septum, more or less truncate above, crowned 

 with one to several conspicuous, obtuse, horn-like projections, 

 epispore thin, smooth, cell contents granular, 15-18 by 45-55 ^: 

 pedicel short, less than half the length of the spore, rather 

 fragile. 



Sori linear, short, minute, obscurely fuscous, covered by the palles- 

 cent epidermis ; spores subsessile, subclavate, crowned at the apex with 

 acute, stellate, radiate, flame-yellow teeth, yellow below. Length of 

 spore .00175 in. Corda, Icon. I, p. 6. 



On leaves and sheaths of oats: Adams, June 30, 5360, II., 

 III., July 10, 5456, II., III., July 11, 5502, II, III.; McLean. 

 July 11, 2334, Sept. 6, 5665, II., III.; Tazewell, July 22, 2330 

 and 2331; McHenry, Aug. 20, 1144. Wheat: Fulton, Oct. 1, 

 1767, II., III. 



