j 24 Puccinia Gramineae. 



Uredospores orange- yellow, subglobose, ovate or broadly elliptic, 

 strongly echinulate, with 2-3 equatorial germ-pores on one face, 

 20-30 x 16-24 p. ; occasionally a few colourless capitate para- 

 physes intermixed. 



III. Teleutosori on both surfaces of leaves, minute, black, linear or 

 ' oblong, often confluent, long covered by epidermis, J-l mm. long. 

 Teleutospores yellowish-brown to brown, elongated clavate, 

 tapering towards base, smooth, constriction very slight or absent, 

 sometimes unicellular, 35-60 x 12-20 p, average 53 X 16 /z; 

 upper cell brown, truncate, thickened at apex, giving off irregular, 

 blunt, generally curved processes variable in size and shape, 

 averaging 6 to 7 or more ; lower cell generally paler in colour, 

 longer than upper, and attenuated towards base ; pedicel persis- 

 tent, coloured, short, stout, up to 1 1 /z long by 8 p. broad. 

 X. Mesospores exactly resembling teleutospores only one-celled. 

 On stem, leaf, and inflorescence of Lolium perenne L. Common. 



Victoria Near Melbourne, Myrniong, Port Fairy, &c., Aug. May. 

 South Australia Mount Gambier, April, 1903, II., III. 



The teleutospores may be found as early as September, and through the 

 summer and autumn. 



In some districts this rust is very severe and kills the grass down to the 

 roots, especially if there are early autumn rains and warm weather. 



Darlucafilum Cast., on uredosori. 



Puccinia lolii avenae. 



On A vena saliva L., and Avenafatua L. 



Victoria Port Fairy, Dec. 1903, and Sept. Nov. 1904, II., III. 

 Brighton, Jan., 1904, II., III. Myrniong, Nov., 1904, II. 

 Near Melbourne, Jan., 1905, II., III. 



New South Wales (Cobb > 2 ). 



Eriksson has shown that the form occurring on Lolium will not infect 

 Avena, nor the reverse, so that there are two biologic forms, and that found 

 on the Oat may be distinguished as P. lolii avenae. 



This species may occur alongside of P. graminis, and the teleutosori 

 were found together on the sheath of the cultivated oat ; A. sativa, and 

 the wild oat, A. fatua. 



The teleutospores on the wild oat are sometimes very much longer than 

 the normal. They range from 70 to 86 /u in length, and from 18-22 p. in 

 breadth at the apex, and 7-8 p at the base. 



By infection experiments Klebahn 2 proved the connexion between this 

 rust, and the aecidiurn on Rhamnns frangula L., but this genus does not 

 occur naturally in Australia. 



P. coronata Corda, was the name originally given to the species occurring 

 on Lolium percnne, Avena sativa, &c., with teleutospores surmounted by a 

 crown of finger-like processes. It was found by culture experiments that 

 the aecidial stage was produced on species of Rhamnus, and Klebahn deter- 

 mined that the spores from some species of grasses produced aecidia 

 exclusively on jRhamnus cathartica, while others did so exclusively on 

 JR. frangula. This showed a biological distinction between the two, and 

 Klebahn proposed the name of P. coronifera for the rust producing aecidia. 





