PAPERS GIVING RUSTS OF NORTH AMERICA. 229 



nitz to think this collection " scarcely the same " as the preceding 

 one on J'iola pcdata, although a careful microscopic examination 

 shows that it has the same small spores and other characters which 

 go with the recia of Uromyccs pcdatatns (Schw.) Sheldon. The 

 name was changed to Jlcidium (Cccoma) sagittatum on page 309 

 of the same work. 



2887. 77. C. A. liiminatiim, L.v.S., Syn. Car. [as A.] nitens, 458, also fre- 

 quent in Pennsylvania on Rubus. The leaves, which with the 

 whole plant are infested by this ^cidium, are degenerate (year 

 after year.) 

 (458. 29. [.-Ecidiuni] nitens Sz. 



A. simple, elongate, peridia very large, yellow, brilliant, at length 

 irregularly ruptured, spore mass orange. 



Frequent on leaves, petioles and younger shoots of Rubus stri- 

 gosus. Its perennial return so infests plants of the whole region that 

 finally it entirely destroys them ; summer. Resembles a Uredo, but 

 it has a distinct peridium. Peridia finally confluent with each other.) 



Represented by tive parts of leaves, each about 4 or 5 cm. long, 

 in a mounted packet, and by many leaves and leaflets in the original 

 packet, which is labelled inside "yEcidium nitens in Rubo villoso 

 Salem Bethl Xcujork," and in another place " Cseoma luminatum," 

 and on the outside "^'Ecidium luminatum LvS in Rub. villos Bethl 

 & Salem." All the leaves are covered with the rust and show the 

 characteristic degeneration of the host. 



It was the custom generally followed by Schweinitz to preserve 

 but the one original collection to represent each species. It is quite 

 evident from its appearance that the ample material of the present 

 species was all gathered at one time, and that it is all, or nearly all, 

 from one plant, as it is very uniform. A part of the material has 

 been seen by Dr. P. A. Rydberg, who monographed the genus Rubus 

 for the " North American Flora,'' and he states that the host can not 

 possibly be R. sti'igosus, but that it may be R. procumhcns IMuhl., or 

 more likely its southern representative R. Enslcnii Walt., both of 

 which usually passed under the name of " R. rillosus," a century 

 ago. It will be noticed that Schweinitz labelled his collection R. 

 villosus and did not change it afterward, although he added Beth- 

 lehem and New York for additional localities, and even changed the 

 name of the rust to what he doubtless considered a better name, and 



