204 ARTHUR-BISBY— TRANSLATION OF SCHWEINITZ'S 



Puccinia having elongated spores and an evident septum. Later 

 the idea of a possible septum was abandoned, and it was necessary 

 to place these dark, globoid, non-septate forms under the all-in- 

 clusive genus Uredo, in spite of their apparent relationship to Puc- 

 cinia. Still later systematists placed them in the genus Uromyces, 

 but recently the opinion has been growing that the earlier method 

 of DeCandolle and Schweinitz better indicates their true relation- 

 ship. 



The mention of the kind of lens used in these studies helps to 

 explain why the question of the presence of a septum should have 

 remained uncertain. Even without knowing the degree of defini- 

 tion, doubtless far less than that of modern hand lenses, it is clear 

 that the magnification left much to be desired. 



*284i. 31. C. U. Chserophylli, L.v.S., on leaves of Chserophyllum or Myrrhis 

 Claytoni, Pennsylvania. 

 C. spots obsolete : sori rounded, sparse and aggregated, even some- 

 M^hat confluent, finally uncovered by rupturing the epidermis. 

 Spores efifused, globose, from tobacco-like to black, shining. 



Represented by a compound leaf of three leaflets, each about 3 

 cm. long, moimted, showing uredinia and telia, and an empty packet, 

 labelled inside " Uredo chserophylli, N. Beth Detwyler," and out- 

 side " Cseoma (Ur) chasrophylli LvS prope Beth Detwyler." 



The rust proves to be Puccinia Pimpinellce (Str.) Mart. (P. 

 Osmorrhizce C. & P.), and the host to be Osmorrhiza, in all prob- 

 ability O. Claytoni (Michx.) Clarke {Myrrhis Claytoni Michx.), as 

 suggested by Schweinitz. The material is essentially identical with 

 that of nos. 2829 and 2851. 



*2842. 32. C. U. Hyperici, L.v.S., on stems of an unidentified Hypericum 

 rare in Carolina ; not the same with C. hypericorum, Lk. 

 C. spots on the pilose-strigose stem, purple : sori sparse, acuminate- 

 ovate, bullate, elevated, surrounded by the ruptured epidermis. 

 Spores fuscous purple, becoming effused. 



Represented by a much branched stem, without leaves, but with 

 eleven seed pods, mounted, having uredinia sparingly distributed 

 over the stem, and by an empty packet labelled " Caeoma (Ur) 

 Hyperici LvS. Salem." 



