PAPERS GIVING RUSTS OF NORTH AMERICA. 217 



color of the spores fits well the uredinia of Puccinia Pyrrhopappi 

 Syd. {P. Krigice Syd.), the only known collection on Krigia having 

 been made by Dr. B. L. Robinson at Asheville, N. C, Aug. 2, 1893, 

 on K. virginica Willd. But that form of rust has scattered sori, 

 and not clustered as in an Mcidhim. Schweinitz thought the fungus 

 not unlike JEcidium Prcnanthis Pers., and fortunately there is a 

 specimen of this species in the Schweinitz collection, which had 

 been received from Kunze. It consists of a smooth, thin, deltoid 

 leaf, some 5 or 6 cm. across, which bore a single cluster of secia, 

 most of which has now disappeared. It is clear, nevertheless, that 

 Schweinitz must have had an aecidioid fungus on the Krigia. The 

 only known form on Krigia with clustered sori having " chestnut- 

 brown " spores is that of the short-cycle species which at another 

 time and on another host Schweinitz called Puccinia maculosa (see 

 no. 2922). The teliospores germinate at maturity in the sorus, and 

 placing some of them under such magnification as Schweinitz prob- 

 ably used, gives the appearance of "spores subglobose, without 

 septum and pedicel." 



The host was well known to the contemporaries of Schweinitz, 

 and comm'only called the "small dandelion" (see Muhlenberg's 

 Catalogue, p. 71). It was considered closely related to Prenanthes. 

 The latest form of the name is Adopogon Dandelion (L.) Kuntze. 



*2868. 58. C. A. Hieraciatum, L.v.S., here and there on the leaves of H. 

 paniculatum and maculatum, Bethlehem. 

 C. spots deep purple, widely effused. Pseudoperidia circinate, on the 

 center of the spot, margins beautifully fimbriate, spores orange. 



Represented by 5.5 cm. of a lanceolate leaf, 2 cm. wide, denticu- 

 late, slightly pubescent beneath, having two groups of acia, and by 

 an empty packet labelled " ^cidium hieraciatum Lv Hieracii panicu- 

 lat Beth." 



The host is correctly named, for the leaf exactly matches the 

 leaves of a phanerogamic specimen collected by Schweinitz at Salem, 

 N. C, now in the herbarium of the Philadelphia Academy, which is 

 without question H. paniculatum. 



The name of the rust was changed by Schweinitz to Mcidium 

 (Ccroma) hieraciatum on page 309 of the same work. The rust is 



