PAPERS GIVING RUSTS OF XORTIl AMKRICA. 221 



leaves, loose in a mounted packet, and by two original packets, one 

 containing a stem 12 cm. long, and a few leaves, labelled " .'Ecidium 

 Gnaphalites LvS 1828," and another containing a few leaves labelled 

 " Cseoma .?£cidium CnapliaUluwi LvS. spec, exim." The collection 

 shows a few oecia. 



The host is without doubt G. obtusifolium L. (G. polycephalum 

 Michx.\ and the rust is the fecial form of what has commonly been 

 called Puccinia invcstita Schw. (no. 2932), but owing to the prior- 

 ity in position of the present specific name, should be called P. 

 gnaphaliata (Schw.) comb. nov. The name was changed by 

 Schweinitz to JEcidiiim (Ccuoma) gnaphalitatum on page 309 of the 

 same work. 



2874. 64. C. A. Clematitatum, L.v.S., Syn. Car. 447 — and collected in Penn- 



sylvania — a good species. 

 (447. 18. [^Ecidium] Clematitis Sz. 



A. pale red, peridia congested, few. 



On younger leaves of Clematis Virginiana, Bethany. A valid 

 species?) 



Represented neither by a specimen nor a packet. In his Caro- 

 lina list Schweinitz was in doubt about the validity of his species, 

 but later felt assured, and consequently added " a good species " in 

 his later list. There can be no question, however, that the fungus 

 is one identical with the well-known JEcidium Clematidis DC, and 

 which has now been proven by cultures in both Europe and Amer- 

 ica to be the aecial stage of Puccinia Clematidis (DC.) Lagerh. (P. 

 Agropyri Ellis & Ev.). 



The variable use of t and d in forming the suffix was not un- 

 common among the earlier mycologists, where in recent years d 

 only is employed, thus the spelling " Clematitis," instead of Clema- 

 tidis, etc. 



Schweinitz changed the name to rEcidium (Cccoma) clematita- 

 tum on page 309 of his later work. 



2875. 65. C. A. Ranunculaceatum, Lk. [11] 150. Frequent, Carolina (Syn. 



Car. 440) and Pennsylvania on various species of Ranunculus, 

 e. g. R. abortivus and others. 



PROC. AMER. PHIL. SOC, VOL. LVII. P, JULY I7. I918. 



