210 ARTHUR-BISBY— TRANSLATION OF SCHWEINITZ'S 



leaves, bearing pycnia and secia of a Phragmidium on their upper 

 surface. It is possible that this European material represents the 

 entry, inadvertently made for North America. It seems more prob- 

 able that Schweinitz found a rust at Bethlehem, which he consid- 

 ered the same, but for which there is now no specimen. If so, the 

 host was probably the European red raspberry, at that time much 

 cultivated in American gardens. In that case the rust may have 

 been the secial stage of Pliragiiiidiitm imitans Arth., although 

 Schweinitz nowhere records the more striking telial stage. The 

 exact status of the record necessarily remains uncertain. 



*28S5. 45. C. U. cylindricum, Lk. io8, on Populus italica, Bethlehem. 



Represented by a 5 cm. square portion, cut from a large, firm 

 leaf, mounted, and by a few small fragments in the original packet, 

 which is labelled " Cseoma (Ur.) cylindrica populina Bet." 



The fragments of leaf are well besprinkled with uredinia, and 

 the microscopic examination shows essential similarity to the ure- 

 dinial stage of Mdampsora Medusa Thiim., the common American 

 rust on various species of Populus. The host may well be the Lom- 

 bardy poplar {Populus dilatata Ait.), as stated, although no other 

 collection on this host has come to hand. 



*2856. 46. C. U. epiteum, Lk. 112, on leaves of Salix nigra, over nearly the 

 whole tree, Bethlehem. 



Represented by two short stems with respectively two and three 

 attached leaves and three unattached leaves placed loosely in a 

 mounted packet, and by small fragments of a young stem and leaves 

 in the original packet, which was at first labelled " Uredo epiteum 

 in Salici nigri Beth," then the word " epiteum " crossed out and 

 " Saliceti " substituted, and afterward the first wording restored. 

 All the leaves are covered beneath rather sparingly with uredinia. 



The collection is the first to be recorded for the very common 

 American form on various willows, Mdampsora Bigdozvii Thiim. 

 The spores are noticeably small and thin-walled for the species. 

 The willow rusts are yet imperfectly understood. The host is 

 clearly Salix nigra Marsh. 



