i o,o Cronartium Leguminosae. 



Uredospores echinulate, without germ-pores. 



Teleutospores unicellular, united into a cylindrical, vertical, horny coluirn 

 germinating in situ, surrounded at base by the uredospores. 

 Sporidiola subglobose, hyaline. 

 Australian species, 1. 



LEGUMINOSAE. 



Jacksonia, &<. 



126. Cronartium jacksoniae P. Henn. 



P. Hennings, Hedw. XL., p. 127 (1901). 



O. Spermogonia honey- coloured, crowded or in lines, circular, flattene 

 on branches and lower surface of leaves. 



Spermatia hyaline, ovoid to ellipsoid, 5-6 X 2J-3 p. 

 III. Teleutosori forming ruddy-brown, straight or curved, simplt 

 columns, crowded, 2-2 J mm. high, with blunt apex, on young and 

 swollen branches. 



Teleutospores ruddy-brown in mass, more or less colourless indi- 

 dividually, elongated, generally somewhat tapering towards 

 end, with large vacuole, cylindrical to fusiform, contents granular, 

 40-50 X 8-10 JJL ; teleutospores germinate at once and produce 

 promycelia with promycelial spores, which are hyaline, globose, 

 and average about 6-7 /z diam. 

 On Jacksonia scoparia R. Br. 



Queensland Darling Downs (Law), (Bailey 3 ). Near Brisbai 

 (Bailey 4 ). 



On Platylobium formosum Sm. 



Victoria Murramurrangbong Ranges, Nov. and Dec., 1902-{ 

 (Robinson). 



On Gompholobium lati folium Sm. 



Victoria Murramurrangbong Ranges, Dec., 1903 (Robinson). 



On Bossiaea cinerea R. Br. 



Victoria Near Melbourne, Nov., 1904 (Robinson). 

 Tasmania Bellerive, Dec., 1905 (Rodway). 



On Aotus villosa Sm. 



Victoria Near Melbourne, Sept., O. Nov., 1904, III. 

 (Robinson). 



It deforms the shoots of the plant on which it grows, causing mal- 

 formation of branches and multiplication of shoots (witches' brooms), and is 

 so common in some parts that the great majority of the shrubs 

 attacked. 



The spermogonia were only found on Aotus and before the appearanc 

 of the teleutospores, but the multiplication and deformation of the shoot 

 had already been produced. On Bossiaea cinerea on one occasion Aecidiu 

 eburneum McAlp. was found on the same plant near Melbourne. 



The horn-like aggregation of teleutospores varies in length from 1-2 mi 

 on Aotus and Bossiaea to 2-2^ mm. in Platylobium and Gompholobium. 



The original specimen on Jacksonia scoparia in the National Herbarium, 

 Melbourne, is given as a variety of C. asclepiadeum (Willd.) Fr., in Berkeley's 

 handwriting, and is recorded in the Journal of the Linnean Society, p. 174 

 (1883), with the remark that the only specimens are in a young state. The 

 same species was subsequently found by G. H. Robinson very plentifully in 

 Victoria on various species of Leguminous plants, and the germinating 

 teleutospores were clearly seen. 



