PAPERS GIVING RUSTS OF NORTH AMERICA. 237 



longer leaf, mounted loose in a packet bearing five large, circinating 

 groups of secia, and by a small fragment of leaf about 3 cm. long, 

 bearing cecia, in the original packet, labelled inside " Roestelia o.xy- 

 acanthae a in Crat. oxyacant prope Philadelphia," and above this 

 written later " Cseoma cylindrites," and labelled outside " 2 Cseoma 

 (Ccratites) cylindrites oxyacanthce in Hedgerows Philad. vulgatis- 

 sima." 



This a^cial rust observed by Schweinitz to be very common, on 

 what was doubtless the English hawthorn (Cratccgus Oxyacantha 

 L.) and thought distinctive, was not again recognized until a trip by 

 Dr. Frank D. Kern ami the senior author to South Carolina in 

 March, 1910, brought it to light. It belongs to Gymnosporangium 

 trachysorum Kern, having telia on Jnniperus virginiana. 



8. Represented by one large, 5 cm. broad, and originally 10 cm. 

 long, strongly pubescent leaf of the cultivated apple, bearing numer- 

 ous small groups of secia, one half, 4 cm. long, being mounted, and 

 the other half, 5 cm. long, in the original packet, which is labelled 

 inside " Rcestelia cancellata In Pyro coronario Salem," with all but 

 the first word afterward crossed out, as if it were an error, and " ;8 

 penicillatum var Mali " substituted, and added below " var. in Malo 

 Bethl," and still later there was written above " Cseoma cylindrites," 

 while on the outside the packet was labelled "2 Cseoma (Ceratites) 

 cylindrites /3 pcnicillat in Pyr. Malo Beth." 



The rust proves to be the secial stage of Gymnosporangium 

 Jnnipcri-virginiancc Schw. and on the common apple Mains Mains 

 (L.) Britton {Pyriis Mains l^.). 



The entry in the North Carolina list, no. 432, is not represented 

 by a specimen, and is too indefinite to be associated with any certain 

 species, unless the form /3 be considered to cover it. 



2900. 90. C. R. Roestelites, Lk. 173. ."Ecid. cancellatum, Sjn. Car. 43J 

 [error for 431]. In Bethlehem in an old orchard rejoicing in 

 huge trees of Pyrus mains. In late autumn I have seen some of 

 these trees, for 6-7 years, so covered by this fungus that the 

 leaves appear red from a long distance. 

 (431. 2. [i^icidium] cancellatum. Very rare, only once on pear 

 leaves.) 



Represented by two sets of very unlike leaves, part of each being 



PROC. AMER. PHIL. SOC VOL. LVM. Q. JILY 17. IQiS. 



