PAPERS GIVING RUSTS OF NORTH AMERICA. 193 



Represented by parts of two leaves, about 5 cm. long, and of 

 two others, 7 cm. long, all 5 to S mm. wide, mounted, and in tiie 

 original packet five similar pieces with some fragments, all bearing 

 an abundance of brown urcdiin'a and a few tclia. The packet is 

 labelled inside " Cseoma (Ured) Rubigo Lk in Androp. avenacei 

 fol Beth 1S29," and outside " Creoma (Ured) Andropogi LvS." 



The host is evidently Andropogon avcnacetim Michx., as stated, 

 now often referred to Sorghastrum mttans (L.) Nash, and the rust 

 proves to be Puccinia virgata Ellis & Ev., a species not at all related 

 to P. Andropogi Schw., no. 2911. 



*282i. II. C. U. Iridis, L.v.S., frequent on withered leaves of Iris virginica, 

 Bethlehem. 

 C. related to C. Lilii; spots yellowish, sori roundish oval, not 

 circinate but scattered; at first covered with the epidermis, rather 

 elevated. Spores numerous, somewhat pedicelled, fulvo-fer- 

 rugineous, at length scattered. Spores rtever turn black as in 

 C. Lilli. 



Represented by two well-preserved pieces of leaves mounted, one 

 being I by 6 cm., and the other 1.5 by 7 cm., and two pieces much 

 eaten by insects, in the original packet, and all well covered with 

 uredinia. The packet is labelled " Puccinia Iridis LvS Beth," with 

 the word Puccinia crossed out and " Casoma (Ur)" substituted. 

 There is an empty duplicate packet labelled in a similar way. 



The rust is a common one of both hemispheres for which the ac- 

 cepted name is Puccinia Iridis (DC.) Wallr. In America, east of 

 the Rocky Mountains, only, uredinia have been found. Although 

 the host is called Iris virginica, a linear-leaved species, both because 

 these leaves are especially wide, and because no rust is known on 

 that species, the host must be /. versicolor L. 



2822. 12. C. U. Smilacis, L.v.S., Syn. Car. 471, Link n. 22, and Bethlehem 



on leaves of Smilax. 

 (471. 13. [Uredo] Smilacis Sz. 



U. peridia variably flexuose, minute, grouped, often concentric, 

 dark brown, the spore-mass luteo-fuscous. 



Frequent, on leaves of Smilax rotundifolia, seated on yellowish 

 spots.) 



Represented by one piece of leaf 3 by 4 cm., cut from a leaf of 

 probably twice the size, and mounted. It is thickly covered with 



