ON GRAMINE.E 



127 



except by cultures ; see also under U. Poae. The teleuto-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. 



JEcidium crassum var. (3 Ficariae Pers. ; Sow. pi. 397, f. 4. 



JE. Ranuncidacearum DC. ; Cooke, Haudb. p. 539 ; Micr. Fung. 



p. 196, pi. ii, figs. 12—14, p.p. 

 Uromyces Poae 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 aecidia. 



^-Eddie-spores. iEcidia hypophyllous or on the petioles, in 

 roundish clusters on yellow 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 /jl. 



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 — 20 yu, ; epispore 1| — 

 2 n thick, with 4 — 9 germ-pores ; 

 a few paraphyses occasionally 

 intermixed. 



Teleuto spores. 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 ytt), smooth, yellowish-brown, 

 apex alone darker, 17 — 28x14 — 20 fx ; epispore l|/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. bidbosus, 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. U. Poae. Teleutospores 

 and the accompanying para- 

 physes, on P. trivialis. 



