Uromycladium Leguminosae. 105 



This genus may be distinguished from Uromyces by the arrangement of 

 the teleutospores, by their shape, which is not elliptical, but depressed globose, 

 and by the presence, in most cases, of a colorless vesicle or cyst. 



Allied witk Uromyces on the one hand and Ravenelia on the other. 



Australian species, 7. 



ANALYTICAL KEY TO THE SPECIES. 

 I. One teleutospore and vesicle in head. 



A. Uredospores fusiform, with hyaline apiculus, and finely 



warted. 



Ur. simplex. 



B. Uredospores sub-elliptical, without hyaline apiculus, thickened 



at apex, and coarsely warted. 



Ur. robinsoni. 

 II. Two teleutospores in head. 



A. Uredospores unknown. 



Ur. bisporum. 



III. Two teleutospores and vesicle in head. 



A. Uredospores sub-elliptical, warted all over, much thickened 

 and dentate at apex. 



Ur. maritimum. 



B. Uredospores sub-clavate, evenly warted all over, and scarcely 



thickened at apex. 



Ur. alpinum. 



IV. Three teleutospores in head. 



A. Teleutospores finely warted, warts arranged in lines ; uredo- 



spores known. 



Ur. Jiotabile. 



B. Teleutospores with converging striae ; Uredospores unknown. 



Ur. tepperianum. 



LEGUMINOSAE. 



Acacia. 



Uromycladium alpinum McAlp. 



O. Spermogonia minute, black, shining, punctiform, crowded,- on both 

 surfaces of phyllodes on discoloured patches, appearing before sori 

 and ultimately surrounded or accompanied by them. 

 Spermatia hyaline, ellipsoid, 3 x 2 /u. 



Sori amphigenous, rusty-brown, scattered or in groups, bullate, soon 

 rupturing epidermis and becoming naked. 



II. Uredospores yellowish-brown to golden-brown, shortly or elon- 



gated clavate, occasionally oval or oblong, warted equally all 

 over, scarcely thickened at apex, with 3-5 equatorial germ-pores on 

 one face, 35-51 x 21-26 //, occasionally reaching a length of 58 p. 



III. Teleutospores at first intermixed with uredospores, two in head 

 with colorless vesicle, depressed globose to subglobose, yellowish- 

 brown to dark-brown, smooth, very slightly thickened at apex 

 with distinct germ-pore, 19-22 x 25-30 p ; vesicle arising from 

 stalk immediately beneath septum, globose or slightly ellipsoid 

 about 25 z diam. 



