PAPERS GIVING RUSTS OF NORTH AMERICA. 213 



to Link, n. ii8. Schweinitz changed the name to JEcidium 

 {Cceoma) aroidatum on page 309 of his later work. 



*236i. 51. C. A. Dracontionatum, L.v.S., frequent on leaves and petioles, 

 and also on the scapes of Arum dracontium, Bethlehem. Not 

 the same as the preceding. Also Salem. 

 C. spots pale, widely scattered over the leaf, occupying nearly the 

 whole of it. Pseudoperidia large, scattered irregularly in dense 

 clusters on the spot. Spores orange color. 



Represented by a much broken leaf, 3 by 5 cm., mounted, thickly 

 covered beneath with large secia, and by a packet labelled inside 

 "^cidium Dracontii In Aro Dracont Salem," and on the outside 

 "^cidium Dracontiatum LvS Salem," containing a few very small 

 fragments of leaf, showing secia. 



The differences noted by Schweinitz betw^een this collection and 

 the preceding one are now ascribed to the influence of the host, and 

 the form is referred to Uromyces Caladii (Schw.) Farl, the host 

 being Miiricauda Dracontium (L.) Small {Arum Dracontium L., 

 Ariscuma Dracontium Schott.). The name of the rust was changed 

 to ^cidium {Cccoma) dracontionatum on page 309 of his later 

 work. 



*2862. 52. C. A. rubellatum, Lk. n. 120, rather rare on various species of 

 Rumex, Salem and Bethlehem. Spots generally sterile. 



It is evident that Schweinitz should have cited here the follow- 

 ing similar entry in his North Carolina list, and have omitted the 

 asterisk. 



(433. 4. [^cidium] Rumicis. Frequently seen as spots on Rumex 

 and Grossularia; but the fungus is very rarely perfect.) 



No Specimen or packet remains to represent these records nor is 

 there any in the Herb. Curtis at Harvard University. Both entries 

 are without doubt founded upon errors of observation. Rumex 

 leaves are often spotted from the action of fungi imperfecti which 

 could easily be mistaken for the small secia not uncommon on this 

 host in Europe. The mention of Grossidaria was doubtless in con- 

 formity with Persoon, who thus associates these hosts. 



