206 Illinois State Laboratory of Natural History. 



tnberculate, 24 by 65-77 ^; pedicel about one and a half times 

 the length of the spore, mostly hyaline, swollen, and elongatr- 

 elliptical from above the middle downward. 



Puccinia mucronata. Crowded, black, spores pediceled, cylindrical, 

 mucronate. Var. 7x'o.s<r. Spores somewhat swollen, obtuse, parasitic on 

 Uredo Ros;<'. Persoon, Syn. Fung., p. 230. 



On roses: Jackson, April 28, 4876, I.; Pulaski, May I. 

 4486, I., 4487, I, May 9, 4580, Nov. 4, 2247; Johnson, May \*>. 

 4639, I., 4640, I, 4641, I., May 13, 4671. L, May 16. 4706, I.; 

 McLean, May 20, 4725, I,, May 25. 4778, L. May 29, 4S13, L; 

 Champaign, June 8, 4917, L, June 10, 4941, L, 4958, TL. July 

 11, 6494, L, II.. III.; LaSalle, June 15, 5000, I., June, 21. 5256, 

 L; McHenry, Aug. 20, 1159, II., III.. Aug. 26. 1317, II.. III.. 

 Aug. 27, 1342, Aug. 31, 1394, Sept. 1,1416, II., III.; Lee, Sept. 

 8, 5713, II., III.; Stephenson, Sept. 13, 5825, IL, III.; JoDa- 

 viess, Sept. 19,5997, IL, III.; Ogle, Sept.-23, 6131,1.; Rock 

 Island, Sept. 27, 1683; Henry, Sept. 28, 1718; Union, Oct. 21, 

 1909, Oct. 29. 2121, Oct. 31, 2135, Nov. 3, 2197. 



Persoon's name (Disp. Meth. [1797] p. 38) for this plant 

 is Puccinia mucronata var. Rosce. As the other variety has 

 been given another name, this should bear the name of the 

 species rather than of the variety. Link introduced (Spec. 

 Plant. II. [1824-25] p. 84) the genus Phragmidium, in which 

 this species is included, hence Ph. mucronatum, Lk., is often 

 written. The supposed secidiof orm described above, referred to 

 under Ph. spec-iosum, sometimes occurs in midsummer at the 

 same time on the leaves with the uredo and teleutospores. 

 The paraphyses are identical in the forms I. and II. , and per- 

 sist with the teleutoform. 



Ph. speciosum, Fries. 



III. On the stems, and less commonly on the petioles, 

 forming swollen, distorted areas of more or less extent. Sori 

 irregularly confluent, grayish-black, on year-old stems crust- 

 like; spores cylindrical-oblong, about five to seven celled, some- 

 times less, scarcely or not at all constricted at the septum, ends 

 rounded, apex mucronate, smooth, almost black, 30 by 60-90 /*; 

 pedicel hyaline below, tinted above, tapering downward, very 

 long, attaining seven or more times the length of the spore. 



