264 



PUCCINIA 



membrane marked with about nine (7—10) germ-pores, which are each 

 surrounded by ;i little thickening of the cell-wall, so that they look some- 

 what Like a " bordered pit " ; the teleuto-sori mostly on the lower leaf-surface 

 or sheath, black, covered by the epidermis ; the teleutospores obconical or 

 with nearly ] .arallt'l sides, truncate, rounded, or pointed (obtusely and 

 often obliquely) at the apex; the slightly thickened apical wall and a 

 broad band at the base chestnut-brown, but the remainder rather pale ; 

 each little group of teleutospores surrounded by a dense wall of brown 

 closely coherent "paraphyses." Oftentimes there are numerous meso- 

 spores, especially on the margin of the sorus. The clavate paraphyses 

 which are frequently present in the uredo-sori of other forms of /'. dispersa 



Fig. 201. P. agropyrina. a, teleutospores; b, paraphyses with the name ; 

 c, plan of paraphyses ; d, paraphysis with uredospores ; e, uredospore. 



are mostly absent in this ; when present they have a thin brownish 

 membrane exactly of the same colour as that of the uredospores. This 

 fungus is as distinctively an autumn parasite as P. glumarum is a spring 



< nic on the same hosts. 



(6) Puccinia Triseti Erikss. 



Puccinia Triseti Erikss. Ann. Sci. Nat. ser. S, ix. 277, pi. xiii, f. 26 — 9 

 (1899). Sydow, Monogr. i. 710. Fischer, Ured. Schweiz, p. 364. 

 Klebahn, I.e. p. 249. 



On Trisetum fiavescens. Uncommon; Alvechnrch, Hereford, 

 etc. June — October. P. graminis occurs on the same host. 



(7) Puccinia simplex Er. et Henn. 



Puccinia simplex E. et H. (ietreicleroste, p. 258 (189G). Sydovr, 

 Monogr. i. 756. Klebahn, I.e. p. 24S. Fischer, Ured. Schweiz, 

 p. 368, f. 266. McAlpine, Rusts of Australia, p. 130, pi. i, f. 1, 

 4, 9 and pi. B, f. 9, 10 (introduced in 1902). 



P. Rubigo-vera var. simplex Kern. ; Plowr. Ured. p. 168. 



