. The British rust fungi (Uredinales), their biology and classification. Uredineae. 264 PUCCINIA membrane marked with about nine (7—10) germ-pores, which are each surromided by a httle 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 pai-allel 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 rema
. The British rust fungi (Uredinales), their biology and classification. Uredineae. 264 PUCCINIA membrane marked with about nine (7—10) germ-pores, which are each surromided by a httle 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 pai-allel 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 "; 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 P. disperm. Fig. 201. P. acjropyrina. a, teleutospores; h, paraphyses with the same; c, plau of paraphyses; d, paraphysis with uredospores ; e, uredospore. are mostly absent in this ; wlien 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. ghimarum is a spring one on the same hosts. (6) PucciNiA Triseti Erikss. Puccinm Triseti Erikss. Ann. Sci. Xat. ser. 8, ix. 277, pi. xiii, f. 26—9 (1899). Sydow, Monogr. i. 716. Fischer, Ured. Schweiz, p. 364. Klebahn, p. 249. On Trisetmnflavescens. Uncommon; Alvechuj'ch, Hereford, etc. June—October. P. grcmiinis occurs on the same host. (7) PucciNiA SIMPLEX Er. et Henn. Puceinia simplex E. et H. Getreideroste, p. 258 (1896). Sydow, Monogr. i. 756. Klebahn, p. 248. 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. Ruhigo-vera var. siinplex Korn. ; Plowr. Ured. }). Please note that these images are extracted from scanned page images
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