OX RANUNCULACE.E 



215 



Teleutospores. Sori hypophyllous, scattered or gregarious, 

 often occupying the whole leaf, roundish, 

 soon naked, pulverulent, dark-brown; 

 spores much constricted, not thickened 

 at the apex, the upper cell nearly 

 globose, the lower globose, obovoid or 

 clavate, generally narrower ; the spores 

 separate readily into their component 

 cells, are covered with large pointed 

 warts, dark-brown (the lower cell paler), 

 26 — 52x18 — 30//,; pedicels hyaline, 

 deciduous. 



Fig. 163. P. Thalictri. Te- 

 leutospores, from Prof. 

 Trail's specimens. 



On Thalictrum flavum, T. minus. Very rare; Kinloch 

 Rannoch, Perthshire (Prof. Trail); Kew Gardens. Autumn. 

 (Fig. 163.) 



This species has all the marks of a perennial mycelium. The same 

 plants are attacked by it year after year ; they are somewhat deformed 

 and taller, with longer internodes, smaller and paler leaves and narrower 

 segments. There is in Fischer a figure of a teleutospore with three cells, 

 looking much like that of a Phragmidium. Cf. Puccinia fusca. 



Distribution : Northern and Central Europe, Siberia, 

 North America. 



87. Puccinia fusca Wint. 



Mcidium fuscum Pers. in Linn. Syst. Veg. p. 1472 (teleutospores). 

 Puccinia Anemones Pers. Obs. ii. 24. Cooke, Handb. p. 503; Micr. 



Fung. p. 209, pi. 4, f. 65—6. 

 P. fusca Wint. Pilze, p. 199. Plowr. Ured. p. 205. Sacc. Syll. vii. 669. 



Sydow, Monogr. i. 530. Fischer, Ured. Schweiz, p. 95, f. 73. 



Spermogones. Hypophyllous, mixed with the teleuto-sori, 

 blackish. 



Teleutospores. Sori hypophyllous, rarely on the upper 

 side, generally spread uniformly over the whole surface of 

 the leaves, here and there confluent, small, round, pulverulent, 

 dark-brown ; spores very much constricted, composed of two 

 almost globose or oblong cells which easily separate, densely 



