196 ARTHUR-BISBY— TRANSLATION OF SCHWEINITZ'S 



word " ovale " crossed out and " Solidaginis " substituted. Halsey 

 was a correspondent living in New York. The fourth original 

 packet is labelled inside " Uredo SoHdaginis in Vernonia nove- 

 boracens Beth," and outside " Caeoma (Ur) Solidaginum LvS 

 Salem & Beth." The packet contains the larger part of four 

 lanceolate leaves, each fragment about i8 mm. wide and 7 cm. long. 

 Three of these leaves are yellowish and are doubtless Solidago 

 altissima, and may have been obtained at Salem, the fourth is 

 greenish with sparse, colorless hairs, and is doubtless 6". rugosa, and 

 may have been obtained at Bethlehem. The inclusion of Vernonia 

 may after a time have been considered erroneous, and the leaves 

 removed. 



All the seven leaves representing this number show uredinia of 

 Coleosporium Solidaginis (Schw.) Thtim., one of the commonest 

 of rusts in the eastern states. The unusual abundance of material 

 preserved to illustrate this number was doubtless due to its being 

 encountered frequently in the fields on many hosts. 



2827. 17. C. U. Terebinthinacese, L.v.S., Syn. Car. 473, not in Pennsylvania. 

 (473. 15. [Uredo] Terebinthinacese Sz. 



U. aggregated, almost solid, pustulate, closed, becoming in- 

 durated, orange red, rather large. Frequent on the lower surface of 

 the very thick leaves of Silphium terebinthinaceum. Related to 

 populina. 



N. B. They [i. e. the Rubigos] occur on almost all autumnal 

 plants of the class Syngenesis, as on Helianthus, Aster, Solidago, 

 etc., etc. As to the Rubigos, which ones constitute distinct species, 

 it is most difficult to decide.) 



Represented only by an empty packet, labelled inside " Uredo 

 terebinthinacecc in Silph terebint Salem," and outside " Caeoma 

 (Ur) Silphii tcrchinthinaci LvS. Salem." 



The rust is undoubtedly Coleosporium Terebinthinacecc (Schw.) 

 Arth., and the host Silphium terebinthinaceum Jacq. 



Schweinitz's observation that it is difficult to decide upon the 

 systematic distinctions among orange-yellow uredinia remains largely 

 true at the present day. 



*2828. 18. C. U. Helianthi L.v.S., rather rare on leaves of H. giganteus, 

 Bethlehem. 



