Puccinia Polygonaceae. 175 



differs in the more finely echinulate uredospores, but more particularly in 

 the teleutospores, which are coarsely knobbed and altogether characteristic. 



The introduced Rumex crispus and R. acetosella are exceedingly common 

 weeds in Victoria, and may be seen growing alongside rusty R. brownii, but 

 no rust has ever been detected on them. 



R. brownii is a native species, and its parasite is evidently a native also. 



The teleutospores are varied in shape, and three and four celled forms 

 are met with. In the three-celled forms they may either be after the 

 Phragmidium or Triphragmium type, and in the four-celled forms the upper 

 third cell is vertically divided. Just as in P. dichondrae there is every 

 gradation from the one to the four-celled spore. 



Darlucafiium Cast., is common on the uredo and teleutosori. 



(Plates XI., Figs. 90, 91, 92 ; XL., Fig. 300.) 



Muehlenbeckia. 



106. Puccinia muehlenbeckiae (Cooke) Syd. 



Sydow, Mon. Ured. I., p. 566 (1903). 

 Sacc. Syll. IX., p. 299 (1891). 



Puccinia rumicis-scutati (DC.) Wint. var. muehlenbeckiae 

 Cooke, Grev. XIX., p. 47 (1890), and Handb. Austr. Fung., p. 

 336 (1892). 



II. Uredosori hypophyllous, scattered or in irregular groups, some- 



times circularly arranged, round or elliptic, girt by the torn 

 epidermis, cinnamon-brown. 



Uredospores yellowish-brown, ellipsoid or ovoid, echinulate, 

 24-32 x 16-21 p, average 28 x 19 p. 



III. Teleutosori similarly arranged to uredosori, but dark-brown. 



Teleutospores at first intermixed with uredospores, clavate to 

 oblong, dark-brown, constricted at septum, thickened at apex (up 

 to 7 p), and rounded or obtuse, sometimes 3-4 celled, 32-45 x 

 14-19 /i, occasionally reaching a length of 55 p, average 40 X 

 1 8 /it ; lower cell generally somewhat triangular ; pedicel hyaline, 

 generally persistent, up to 40 p long. 



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

 elongated oblong, smooth, rounded or conoid and thickened at apex 

 (up to 5 p), 31-34 x 12-18 p. 



On leaves of Muehlenbeckia adpressa Meissn. 



Victoria Brighton, May, 1894 (Morrison). Near Melbourne, 

 Jan.-July. Cape Schanck, March, 1903 (C. French, jun.). 

 Frankston, Feb., 1904 (Robinson). Sandringham, Sept., 

 1905, II., III. 

 On Muehlenbeckia gracillima Meissn. 



Queensland Gladfield (Gwyther) (Bailey 15 ). 

 N.S. Wales Kurrajong Heights (Musson). 



Some of the mesospores show their connexion with teleutospores very 

 clearly. In one instance two germ-pores were formed in the usual positions, 

 while in another there was a slight notch on one side as if the beginning of 

 a septum. They are evidently one-celled teleutospores, and have all 

 characters with the exception of the septum. 



