j-^2 Puccinia Gramineae. 



X. Mesospores very rare, similarly coloured to teleutospores, elongated 

 ellipsoid, rounded and slightly thickened at apex, tapering very 

 slightly towards base, 58 X 21 ju. 



On Phragmites communis Trin. 



S. Australia The -Grange, near Adelaide, April, 1891 (Tepper) 

 (Ludwig 3 ). 



The mesospores had all the appearance of teleutospores without the 

 septum. The rounded apex and stalk at base showed that this was not 

 the basal cell of a normal teleutospore. 



(Plate II., Fig. 19.) 



Triticum. 



54. Puccinia triticina Eriks. 



Eriksson, Ann. Sci. Nat. Series VIII., p. 270 (1899). 

 Sydow, Mon. Ured. I. p. 716 (1903). 

 Sacc. Syll. XVII., p. 376 (1905). 



P. dispersa f. sp. tritici Eriks. and Henn., Zeitschr. f. 

 Pflanzenk. IV., p. 257 (1894). 



II. Uredosori 1-2 mm. long, reddish-brown, amphigenous, but mostly 

 on upper surface of leaf -blade, elliptic, sometimes confluent, scat- 

 tered or somewhat gregarious, occasionally on sheath and stem. 



Uredospores subglobose to shortly ellipsoid, echinulate, orange- 

 yellow, 4-6 scattered germ-pores on one face, 20-28 x 18-21 p. 



Teleutosori oblong, black to dark-brown, hypophyllous, scattered, 

 often arranged lengthwise in lines, sometimes on sheath and stem, 

 covered by epidermis, divided into compartments surrounded by 

 brown paraphyses. 



Teleutospores clavate to oblong, smooth, yellowish-brown to 

 dark-brown, slightly constricted at septum, very occasionally 

 3-celled, 39-57 x 15-18 /u, average 48 x 16 ^; upper cell deeply 

 coloured, generally rounded or flattened at apex and thickened, 

 17-31 x 15-18 n ; lower cell paler and attenuated towards pedicel, 



Ill 



longer and narrower than 

 short, coloured. 



upper, 22-36 x 12-14 p ; pedicel 



X. Mesospores occasional, similarly coloured to teleutospores, ellipsoid 

 to clavate or sub-clavate, shortly stalked, smooth, slightly thickened 

 at apex, 25-38 x 13-16 p. 



On wheat, Triticum vulgar e Vill. and T. polonicum L. Common. 



Victoria, New South Wales, Queensland, South Australia, West 

 Australia, and Tasmania. 



The uredospores are distinctly different from those of P. graminis in being 

 subglobose instead of elongated, and the more numerous germ-pores are 

 scattered instead of forming an equatorial band. 



Uredospares taken from young wheat plants in the winter months (June- 

 August) readily germinated in a moist chamber. 



(Plate I., Figs. 3, 6, 10; Plate XL., Fig. 302; Plate A., Figs. 1, 2.) 



