Uromyces Polygonaceae. 99 



which Cronartium \tas first determined, and Mr. Bailey has sent me a speci- 

 men from his herbarium labelled " Roestelia polita Berk., " and which was so 

 named by Berkeley. On comparing the Brisbane specimen with the Darling 

 Downs specimen, they are seen to be the same, and Berkeley's original deter- 

 mination of Cronartium is correct. When it is remembered that Roestelia, 

 polita Berk., has only been found 011 Muehlenbeckia and not on Jacksonia it 

 will reconcile certain discrepancies in Berkeley's original descriptions and 

 drawings. In the original description of JR. polita the spores are given as 

 large, while in connexion with its occurrence on Jacksoniait, is stated "the 

 spores are globose about *0003 inch in diam. (7-7|- /u)." If we turn to the 

 drawings on PI. ] 5, the otherwise puzzling figures become clear when they 

 are taken to represent a Cronartium, and it will be seen from the description 

 of this fungus on Jacksonia that the so-called aecidiospores are really the 

 promycelial spores of that fungus. 



If the identical specimen in the Kew Herbarium, to which Berkeley referred, 

 is examined I have no doubt it will turn out to be a Cronartium. At the 

 time Berkeley wrote our knowledge of the distinctions between these forms 

 was not so clear as now, but still the projecting pseudoperidium of the 

 so-called Roestelia, with its characteristic peridial cells and contained spores, 

 is quite distinct microscopically from the outwardly similar column of 

 teleutospores of Cronartium which are wedged together into a solid mass. 



In the original description the locality for New South Wales is given as 

 " Bambamero " Lake, but Dr. Howitt informs me that the name is as 

 above, and that the lake is situated 20 miles from Menindie, close to the 

 Darling River. 



(Plate XXXIX., Figs. 297, 298; Plate XLIIL, Fig. 317.) 



Polygonum. 



20. Uromyces polygon! (Pers.) Fckl. 



Fuckel, Symb. Myc., p. 64 (1869). 



McAlpine, Agr. Gaz., N.S.W., VII., p. 301 (1896). 



Sacc. Syll. VII., p. 533 (1888). 



0. Spermogonia yellow to honey-coloured, conoid, in small groups. 



Spermatia hyaline, minute, 3 x 2 p. 



1. Aecidia crowded in roundish patches, bright orange, mostly hypo- 



phyllous, but often opposite ; pseudoperidia rather flat, with broad 

 whitish torn edges. 



Aecidiospores subglobose, finely verrucose, pale yellow to orange 

 yellow, 16-28 p diam. 



II. Uredosori pale cinnamon to rusty brown, scattered, or arranged in 



a circinate manner and confluent, mostly amphigenous, pulveru- 

 lent, round to oval, surrounded or partially covered by ruptured 

 epidermis. 



Uredospores ellipsoid to obovate, yellowish brown, finely 

 echinulate, with generally two lateral germ-pores on one face, 20-29 

 x 16-21 p, average 24 x 20 p. 



III. Teleutosori scattered, blackish, pulvinate, roundish on leaves, 

 elongated on stems, bursting through browned epidermis, confluent 

 in masses, surrounding and distorting stem. 



