Puccinia Umbelli ferae. 169 



onAethusa cynapium from Sydow's Ured. Ex.sicc., 1261, which is readily dis- 

 tinguishable from either of the above. There is thus a clear distinction be- 

 tween these three recognised species, but the synonymy is rather confix 

 The reason for the name I have adopted may first be given. P. cast< 

 Thuem., on cultivated celery agrees with our species, but P. castagnei 

 Schroet., in Cohn's Beitrage, III., 62 (1879), was first applied to a Puccinia 

 on Thalictrum angustifolium, and Thuemen's name being thus preoccupied, 

 I have substituted P. thuemeni. 



As regards the synonyms, Cooke, in his Australian Handbook, gives P. 

 apii Corda at first, and then in an addendum substitutes P. castagnei Thuem. 

 for it. 



Then Saccardo, in his Sylloge, gives P. bullata with P. apii as a 

 synonym, and P. castagnei is regarded as distinct. Further, Sydow in his 

 Monograph includes P. apii Corda, and P. castagnei Thuem., under P. apii 

 Desm., and P. bullata is given separately, although he remarks that the 

 latter is probably a collective species. The teleutospores of P. bullata are 

 described as smooth, and therefore do not agree with the quoted specimen 

 from Sydow. Finally, it may be noted that Tranzschel ] has shown that the 

 host-plant of P. castagnei Schroet., is not Thalictrum angustifolium, but an 

 TTmbellifer, and probably Silaus pratensis, so that this species is a synonym 

 of P. bullata. 



Darluca filum Cast., occurs on the uredosori and teleutosori. 

 (Plate IX., Figs. 68-75 ; Plate C., Figs. 16, 17.) 



Xanthosia. 



Puccinia xanthosiae McAlp. 



II. Uredosori amphigenous, and on leaf-stalks, dark-brown, pulvinate, 



gregarious, elliptical, often confluent, rupturing epidermis, about 

 ^ rnm. long, often causing entire leaf to become brownish. 



Uredospores golden-brown, thick-walled, eehinulate, globose to 

 elliptical, 30-32 ^ diam., or 30-37 x 24-28 p, average 34 x 26 /tx; 

 pedicel colourless, 4-6 p broad. 



III. Teleutosori rare, on leaves of previous year, minute, black. 



Teleutospores oblong to oblong clavate, dark-brown, smooth, 

 constricted at septum, 40-60 x 20-25 p, average 42 X 20 p ; 

 upper cell generally darker than lower, rounded and slightly 

 thickened at apex, occasionally truncate ; lower cell rounded at 

 base or attenuated towards stalk ; pedicel persistent, tinted, about 

 20 p long. 



X. Mesospores occasional, similarly coloured to teleutospores, obovate, 

 thickened at apex, 32 x 20 p. 



On Xanthosia pusilla Bunge. 



Victoria Frankston, Oct., 1899, II. : Oct., 1903, III. Sandring- 

 ham, Sept., March, II, III. ; Feb., II. 



(Plate IX., Fig. 76.) 



