. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON GRAMINEiE 127 except by cultures ; see also under U. Poae. The telcuto-sori of the present species are more numerous and much more conspicuous than those of U. Poae. They resemble the spots of Phyllachora graminis on the same host. Distribution : Europe only, not yet found in America. 38. Uromyces Poae Raben. ^cidmm crassum var. /3 Ficariae Pers. ; Sow. pi. 397, f. 4. jE. Ranunculaceamm DC. ; Cooke, Handb. p. .; Micr. Fung. p. 196, pi. ii, figs. 12—14, Uromyces Puae Rab. Unio itin. 1866, no. 38. Plo
. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON GRAMINEiE 127 except by cultures ; see also under U. Poae. The telcuto-sori of the present species are more numerous and much more conspicuous than those of U. Poae. They resemble the spots of Phyllachora graminis on the same host. Distribution : Europe only, not yet found in America. 38. Uromyces Poae Raben. ^cidmm crassum var. /3 Ficariae Pers. ; Sow. pi. 397, f. 4. jE. Ranunculaceamm DC. ; Cooke, Handb. p. .; Micr. Fung. p. 196, pi. ii, figs. 12—14, Uromyces Puae Rab. Unio itin. 1866, no. 38. Plowr. Ured. p. 131. Sydow, Monogr. ii. 310. Fischer, Ured. Schweiz, p. 72, f. 55. Spermogones. Epiphyllous, honey-coloured, a few also on the lower surface among the lecidia. jEcidiospores. ^cidia hypophyllous or on the petioles, in roundish clusters on 3'ellow spots, which on the petioles are often elongated, cup-shaped, yellow, with torn, recurved margin ; spores delicately verruculose, clear-yellow, 17—25 x 12—20 Uredospores. Sori amphigenous, scattered or in rows, small, elliptic or oblong, at first covered by the epidermis, pulverulent, yellowish-brown; spores globose to ovate, faintly echinulate, yellow, 14—25 X 14—20ya ; epispore 1^— 2 fjb thick, with 4—9 germ-pores; a few paraphyses occasionally intermixed. Teleutospores. Sori generally hypophyllous, similar to the uredo- sori, but always covered by the epidermis, compact and black; spores oblong-ellipsoid to pyriform, rounded or truncate above, not much thickened (up to 4 or 5 //,), smooth, yellowish-brown, apex alone darker, 17—28x14—20/*; epispore \^[x thick; pedicels brownish, as long as or shorter than the spore; para- physes numerous, brown, agglutinated, as in U. Dactylidis. iEcidia on Ranunculus auricomus, R. hidhosus, R. Ficaria, R. repens, March—May; uredo- and teleutospores on Poa annua, P. nemoralis, P. pratensis, P. trivialis, May—September. (Fig. 78; see also Fig. 211.). Fig. 78. TJ
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