220 ARTHUR-BISBY— TRANSLATION OF SCHWEINITZ'S 



hairy. Spores under the microscope yellow-fuscous, vesicular ; when 

 old pellucid, white.) 



Represented by a lanceolate, very tomentose leaf, 4.5 cm. long, 

 and part of another similar leaf, both mounted, showing small 

 groups of secia. An empty packet is labelled inside " ^cidium 

 Helianthi mollis Salem," and outside "^cidium helianthatum LvS. 

 on Helianthi molli Salem." 



The name was changed by Schweinitz to ^cidium (Cceoma) 

 helianthatum on page 309 of his later work. This collection rep- 

 resents the basis for the earliest name to be applied to any part of 

 the cycle of the American sunflower rust which is generally called 

 Pucdnia Helianthi Schw. A less convenient, but technically more 

 correct name, therefore, is P. Helianthi-moUis (Schw.) comb. nov. 



*2872. 62. C. A. Trachelifoliatum, L.v.S., here and there on the leaves of 

 Helianthus trachelifolius, Bethlehem. 

 C. spots broadly effuse, yellowish or rufous, confluent, large. Pseu- 

 doperidia very densely aggregated in the center, as if crowded 

 and appressed to each other, and hence somewhat angular, mod- 

 erately elevated ; margin not fimbriate. Spores yellow, finally 

 decolored. 



Represented by parts of two originally large leaves, 3 and 4 cm. 

 broad respectively, mounted, and by three broken leaves and many 

 fragments in the original packet, which is labeled " /Ecidium Heli- 

 anthi trachelif." The leaves bear a number of groups of secia. 



The fungus is the secial stage of the common sunflower rust, 

 Puccinia Helianthi-mollis, and the host, so far as the specimen 

 shows, is as given by Schweinitz. The name wa3 changed by 

 Schweinitz to JEcidiiim (Caroma) trachelifoliatum on page 309 of 

 the same work. 



♦2873. 63. C. A. Gnaphaliatum, L.v.S., striking and very common in the late 

 autumn on leaves (under side), also on the woolly stems of 

 Gnaphalium polycephalum, Bethlehem. 

 C. hypophyllous, at first cloaked in the wool of the leaves and stems. 

 Spots more or less effuse, yellowish. Pseudoperidia only a few, 

 but densely approximate, very often even single, very long, and 

 very white, cylindric, apex fimbriate. Spores orange yellow. It 

 is related to C. Pini in the form of the peridium. 



Represented by two stems, each 6 cm. long, and many crumpled 



