PAPERS GIVING RUSTS OF NORTH AMERICA. 249 



(495. lu. [Puccinia] Helianthi Sz. 



P. rather small, orbicular, aggregated, black, spores globoid- 

 oval, bilocular, very long pcdicolled. 



Common on many Helianthi. — Spores fuscous yellow, pedicel 

 white, pellucid.) 



Represented l)y an original packet containing twenty or more 

 fragmentary leaves, 1-4 cm. \vi<lo by 6-10 cm. long, and a leafy 

 stem, 5 cm. long, bearing one mature flower head, the leaves richly 

 supplied with telia. The packet is labelled " Puccinia HcUan- 

 thonim Lv.S 1826." 



The leaves of this collection are lanceolate or ovate-lanceolate, 

 and probably came from the upper part of the plant. Examination 

 of the leaves together with the flowering head makes it certain that 

 the host is Hclianthiis tubcrosus L., and the date, " 1826," shows 

 that the collection was made in Pennsylvania, doubtless at Bethle- 

 hem. The rust still generally goes by the name first given by 

 Schweinitz, P. Helianthi, although his specific name for the secial 

 stage (no. 2871) has priority of place in the same publication and 

 technically should replace it as P. HcUanthi-mollis. 



Schweinitz evidently inserted " clearly distinct " under this entry, 

 and similar expressions in the following and other entries to em- 

 phasize his dissent from Link's opinion (1. c.) that the species might 

 be the same as the European P. Syngencsarum Link. 



2924. 20. P. Heliopsidis, L.v.S., Syn. Car. 493, Lk. p. 74, and Pennsylvania — 



entirely distinct. 

 (493. 8. [Puccinia] Heliopsidis Sz. 



P. rather irregular, aggregated, surrounded by the epidermis, 

 chestnut brown, spores oval, elongate, long pedicelled, bilocular. 



Frequent on dried leaves of Heliopsis, also on Vernonia. — Cells 

 of the spores equal, septum situated exactly in the middle of the 

 spore.) 



Represented only by an empty packet, labelled " Puccinia Heliop- 

 sidis LvS." 



The rust on Heliopsis is still known by the name given to it bv 

 Schweinitz. It has only been found on H. hcliantlwides (L.) 

 Sweet. Although given as " frequent." yet it is represented by onlv 

 five collections in the Arthur herbarium, all from the Mississippi 



