PAPERS GIVING RUSTS OF NORTH AMERICA. 215 



leaves and a small portion of a stem, now in rather poor condition, 

 and showing only a few aecia on one of the leaves, labelled inside 

 " ^cidium Pentstemonitis Salem,'' and on the outside " ^cidium 

 Pentstemoniat LvS Salem." Although there is no mounted speci- 

 men there are pin marks where one may have been attached. 



The rust is common in the eastern United States, and is the 

 ascial stage of no. 291 1, Puccinia Andropogonis Schw., as proven by 

 cultures first made by the senior author in 1899 {Bot. Gas., 29 : 272), 

 and subsequently repeated a number of times. The southern Pent- 

 stemon, corresponding to the northern P. hirsiitns, is P. australis 

 Small. Schweinitz changed the name of the rust to Alcidium 

 (Ccronia) pentsteuwniatiim on page 309 of his later work. 



2865. 55. C. A. Apocynatum, L.v.S., Syn. Car. 448, Lk. n. 135, not yet [seen] 



in Pennsylvania. 

 (448. 19. [^cidium] Apocyni Sz. 



A. orbicular, very large, orange, pale below. Peridia arranged 

 in a few concentric circles, somewhat fuscous. 



On leaves of Apocynum cannabinum in the mountains. Spots 

 delicate. Peridia when closed from yellow to chestnut-brown or 

 somewhat fuscous, when open with a pale, lacerate margin. Spores 

 simple, white.) 



Represented by a mounted specimen of the middle part, 4 cm. 

 long, of a 3.5 cm. wide leaf, bearing beneath two groups of aecia, 

 centrally placed on dark spots 7 mm. across, and by a packet con- 

 taining a small part of a leaf, showing no fungus, and labelled 

 "^cidium Apocyniatum in Apocyn. pubes. Salem." 



This rust is not much better understood than in the days of 

 Schweinitz. Only six other collections are known to the writers, 

 which have come from Delaware, New Jersey, District of Columbia 

 and North Carolina. It is probably a heteroecious form, but no 

 suggestion has been made regarding the alternate host. The name 

 was written Alcidium (Ccrouia) apocynatum- by Schweinitz on 

 page 309 of his later work. 



2866. 56. C. A. Convolvulatum, L.v.S., Syn. Car. 454. very frequent also in 



Pennsylvania on C. panduratus. 

 (454. 25. [^cidium] Ipomoese-panduranse Sz. 



A. very large, bullate, depressed above, white, peridia flexuose, 

 rather large, elevated, ruptured by a slit, spore-mass cinereous- 

 golden-red. 



