232 ARTHUR-BISBY— TRANSLATION OF SCHWEINITZ'S 



The rust is the secial stage of Uromyces proeminens (DC.) Pass., 

 and the host is Chamcesyce Preslii (Guss.) Arth. (Euphorbia PresHi 

 Guss.), which passed under the name of E. hypericifoUa in Schwei- 

 nitz's time. Link's Ccroma EtipJiorbiatum is an entirely different 

 species, being the secial stage of a heteroecious form. On page 309 

 of Schweinitz's later work the name is changed to ^cidium 

 {Ccuoma) Euphorbia hypericifoliw. 



*28qi. 81. C. A. Houstoniatum, L.v.S., rather rare, but where occurring 

 very copious on stem, leaves and peduncles of Houstonia 

 coerulea, Bethlehem. 

 C. without distinct spots. Pseudoperidia elevated, pale, subconic, 

 apex contracted, and somewhat excavated. Spores orange. The 

 infected and somewhat degenerate plants, nevertheless, flower. 



Represented by three or more entire plants mounted loose in a 

 packet, all considerably drawn, but a few with flowers, and by an 

 original packet containing many rusted plants, which is labelled 

 ".^cidium Houstoniatum LvS Beth." 



The rust is the ?ecial stage of Uroinyces houstoniatus (Schw.) 

 Sheldon, having telia on Sisyrinchiiim, as proven by cultures. The 

 combination Aicidium (C(€oma) houstoniatum is made on page 309 

 of the same work. 



*28g2. 82. C. A. Claj'toniatum, L.v.S., on C. virginica from New York. 

 Communicated by Dr. Torrey. 

 C. almost simple and without spots, occupying the entire leaf. 

 Pseudoperidia broad, sparse. Spores orange. 



Represented by a mounted stem, 5 cm. long, with one unopened 

 flower and two leaves, the leaves covered with secia, and by an orig- 

 inal packet containing one narrowly linear leaf, 6 cm. long, and 

 labelled " yEcidium Claytoniat LvS Torrey." 



A rather common rust, being the aecial stage of Puccinia clay- 

 toniata (Schw.) Peck. Schweinitz made the combination ^cidium 

 {Ccroma) claytoniatum on page 309 of the same work. 



*2893. 83. C. A. Pyrolatum, L.v.S., on the under side of the leaves of Pyrola 

 rotundifolia. Dr. Torrey. 

 C. without spots. Pseudoperidia sparse, occupying the whole leaf, 

 but not transforming it, pulvinate-elevated, pale, or orange with 



