Puccinia Gramineae. 127 



Zea. 



47. Puccinia maydis Bereng. 



Bereng., Atti VI., Riun. sc. ital., Milano, p. 475 (1844). 

 Cooke, Handb. Austr. Fung., p. 337 (1892). 

 Sydow, Mon. Ured. I., p. 830 (1904). 

 Sacc. Syll. VII., p. 659 (1888). 



Puccinia sorghi (in part) Schweinitz, N. Amer. Fung., p. 295, 

 (1831). 



II. Uredosori amphigenous, elliptic or oblong, scattered or united 



into larger or smaller groups, here and there confluent, rather 

 convex, soon erumpent from the longitudinal fissure of the 

 cuticle, reddish-brown. 



Uredospores ellipsoid or obovate, slightly warted, at first 

 yellowish then reddish brown, with two to three equatorial germ- 

 pores on one face, 23-38 x 20-26 p. 



III. Teleutosori amphigenous, scattered or subgregarious, variable in 

 form, mostly linear or oblong, long covered by epidermis, pro- 

 minent, very black, 1-2 mm. long. 



Teleutospores obovate to oblong or subclavate, bright chestnut 

 brown, smooth, constricted at septum, rounded or conoid and 

 thickened at apex (up to 8 p), sometimes truncate, roundated, 

 base and rarely somewhat attenuated, occasionally 3 or 4 celled, 

 32-52 x 16-24 ^, average 36 x 20 p. upper cell rarely 

 vertically divided ; epispore thick ; pedicels persistent, elongated, 

 yellowish, thickened particularly towards apex, up to 90 p, long. 



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

 rounded at both ends, thickened at apex, average 35 x 17 p. 



On leaves of Zea mays L. 



Victoria. Seville, April, 1897, II. (Hill). Tally Ho, April, 1902, 

 II. (Cronin). Leongatha, March, 1904, II. Near Mel- 

 bourne, April, 1904, II., III. 



New South Wales. Richmond (Cobb). 



Queensland. Toowoomba, 1887 (Tryon 1 ), (Bailey 1 , 5 ). 



Schweinitz considered that the same rust occurred on sorghum and 

 maize to which he gave the name of P. sorghi, but since they are now found 

 to be distinct Sydow in his Monograph has reserved the above name for 

 this one. 



Arthur 4 inoculated maize plants with uredospores from an aecidium on 

 Oxalis cymosa Small, and in five days uredosori appeared in abundance. 

 The Oxalis is supposed to have been inoculated from the teleutospores of 

 P. maydis, but this infection has still to be verified. 



Darlucafilum Cast., occurs on the uredosori. 



(Plate II., Figs. 15, 16; Plate C., Figs. 14, 15.) 



Alopecurus. 



48. Puccinia perplexans Plow. 



Plowright, Quart. Journ. Micro. Sc. XXV., p. 164 (1885). 

 Sydow, Mon. Ured. L, p. 719 (1903). 

 Sacc. Syll. VIL, p. 632 (1888). 



II. Uredosori amphigenous and on sheath, orange, elliptic, rupturing 

 epidermis and often confluent in lines. 



