PAPERS GIVING RUSTS OF NORTH AMERICA. 205 



The rust is the uredinial stage of Uromyces Hyperici-frondosi 

 (Schw.) Arth., and the host is some species of Hypericum, not yet 

 identified, but which doubtless can be. Schweinitz was right in 

 thinking his material quite different from Ccuonia hypericorum Link, 

 which belongs under the genus Mclampsora. 



2843. Z2)- C. U. Heucherse, L.v.S., Lk. 79, Syn. Car. 479, not in Pennsylvania. 

 (479. 21. [Uredo] Heucherae Sz. 



U. seated on orbicular, yellowish spots, peridia subconcentric, 

 crowded, dark chestnut brown, spore mass dark fuscous. 



Here and there on the leaves of Heuchera Americana and vil- 

 losa. Peridia at first closed ; at length scattering the spores, minute. 

 Related to U. Anemones.) 



Represented by part, about 4 by 5 cm., of a large leaf, mounted, 

 having small, hypophyllous, pulvinate, brown sori, and by an empty 

 packet labelled inside " Uredo Tiarellse Heucherss Salem," and on 

 outside " Cseoma (Ur) Heuchercs LvS. Salem." 



The spores are oblong, two-celled, and smooth whether examined 

 wet or dry. The rust is now called Puccinia Heucherce (Schw.) 

 Dietel. The mounted leaf appears to be that of HcucJiera amer- 

 icana L., but the rust is known to occur on many species, and may 

 well have been seen by Schweinitz on H. villosa Michx. 



The systematic position of the species must have been deter- 

 mined by Schweinitz from the gross appearance alone. This would 

 account for its inclusion in the subgenus Uredo, and for the omis- 

 sion of spore characters in the description. 



*2844. 34. C. U. apiculosum, Lk. [n. not] p. 90, on Phaseolus, Bethlehem, 

 Syn. Car. 478. 

 (478. 20. [Uredo] flosculosorum. Conspect. fung. On Kuhnia, 

 Eupatorium, and other composites. (Cseomurus Link.)) 



No specimen or packet remains to represent this number. Two 

 typographical errors occur in the entry. The asterisk should be 

 omitted, and the reference to Link's work should read n. 90, and 

 not " p. 90," the reference being to the number of the species and 

 not to the page. 



The name Uredo flosculosorum was established by Albertini and 

 Schweinitz (Consp. Fung. Nisk. 128) and they named as hosts 



PROG. AMER. PHIL. SOC, VOL. LVII, O, JULY IJ , I918. 



