86 UROMYCES 



The species are arranged according to the families to which 

 the hosts belong: sec I'nrr'uiia. This genus is often considered 

 the must highly (a1 least the latesl I evolved of the Uredinales ; 

 ltut rather it forms a heterogeneous group, the species of which 

 have arisen at different times from various species of Puccinia. 



1. Uromyces Valerianae Fckl. 



Uredo Valerianae Schum. PL Sail, ii. 233. 



/Ecidium Valerianearum Duby, Bot. Gall. ii. 908. Cooke, Handb. 



p. 540; Micr. Fung. p. 196. 

 h-i-t/tlii'ii Yuli -ri(inii<: Berk. ; ('coke, Handb. p, 532 : .Micr. Fung. p. 222. 

 Uromyces Valerianae Fckl. Symb. Myc. p. 63. Plowr. Fired, p. 12*. 



Sacc. Syll. vii. 536. Sydow, Monogr. ii. 19. Fischer, Ured. 



Schweiz, p. 54, f. 41. 



Spermogones. Epiphyllous, in small clusters, honey- 

 coloured, turning black. 



Mddiospores. iEcidia hypophyllous, and often on the 

 nerves, petioles and stalks, seated on pale thickened spots, 

 densely aggregated or circulate, cup-shaped, whitish-yellow: 

 margin revolute and torn; spores covered with minute crowded 

 warts, yellow, 18 — 25 x 16 — 20 (jl. 



Uredospores. Sori amphigenous, usually on indefinite 

 yellow spots, scattered or aggregated here and there, minute, 

 punctiform, pulverulent, brown; spores globose to broadly 

 ellipsoid, verrucose-echinulate, yellowish-brown or brown, 21 — 

 28 //. ; epispore 1\ — 3 ^ thick, with two or three germ-pores. 

 Teleutospores. Sori similar, but longer covered by the 



epidermis, dark-brown; spores ellip- 

 soid or ovate, with a flat subhyaline 

 papilla at the summit, smooth, pale 

 clear-brown 20 — 30 x 13 — 21 /j,; epi- 

 spore thin, scarcely thickened above ; 

 pedicels short, thin, hyaline, rather 



„. . )0 „ 17 , . rp , deciduous. 



Fig. 88. U. Valerianae. Teleu- 

 tospores and uredospore (the . . ,_ ~ . 

 latter viewed dry) on V. offici- On Valeriana dwica, V. qffi-ci- 



"" hs - nalis. iEcidia in May and June ; 



uredospores from June, teleutospores from July to October. 

 Common. (Fig. 38.) 



