250 ARTHUR-BISBY— TRANSLATION OF SCHWEINITZ'S 



region, three with secia, one with uredinia, and only one showing 

 telia. The species must be local, although widespread. 



2925. 21. P. Verbesinse, L.v.S., Sjm. Car. 496, Lk. p. 74, not j'et in Pennsyl- 

 vania — good species. 



(496. II. [Puccinia] Verbesinse Sz. 



P. punctiform, sparse, fuscous black, spores ovate, bilocular, 



pedicel short. 



On flourishing leaves of Verbesina, Sigesbeckia (Richweed). — 



Spores narrower at the apex than at the base, bilocular : cells equal. 



Not surrounded by the epidermis.) 



Represented by an empty packet, which is labelled on the inside 

 " Dicseoma Verbesinse Salem," and on the outside " Puccinia Ver- 

 bcsincc LvS Salem." 



Schweinitz's name still holds good for the Verbesina rust of the 

 region he explored. It most likely does not occur on Sicgesheckia 

 (richweed), on which no rust has yet been found. 



*2926. 22. P. Vernonise, L.v.S., very common on Vernonia, Bethlehem. 



P. without spots. By the rather pulvinate sori and by the beautiful 

 rusty color of the spores it differs from P. Helianthi. It occurs 

 also occasional!}' on Helianthus. 



Represented by an empty packet, labelled " Puccinia Vernonia; 

 LvS in Heliant ferrugin." 



This is without doubt the leaf form of the common Vernonia 

 rust, the stem form of which Schweinitz had already named P. 

 hullata (no. 2919). The rust does not occur on Helianthus, al- 

 though occasionally the Helianthus rust simulates the one on Ver- 

 nonia. 



2927. 23. P. Xanthii, L.v.S., Syn. Car. 500, Lk. n. 22,. Also frequent on 

 leaves of Xanthium in Pennsylvania. Beautiful and conspicuous 

 from a distance. Sori usually concentric and aggregated in the 

 center of the spot. 

 (500. 15. [Puccinia] Xanthii Sz. 



P. spots delicate, orbicular, pale, beneath fuscous brown with a 

 pale margin, spores oblong, bilocular, pedicellate. 



On lower surface of the leaves of Xanthium strumarium, in 

 sandy places. Beneath it shows at first pale vesicles resembling the 

 cells of the leaf, these being broken and encircled by the epidermis, 

 the spores appear in a coherent fuscous pustule, yellow under a lens, 

 the pedicel longer than the spore.) 



