ON COMPOSITE 



135 



7. Puccinia Tanaceti DC. 



Puccinia Tanaceti DC. Flor. fr. ii. 222. Cooke, Micr. Fung. p. 207. 



Plowr. Ured. p. 189 p.p. Sacc. Syll. vii. 657. Sydow, Monogr. i. 



161. Fischer, Ured. Schweiz, p. 185, f. 146. 

 P. Discoidearum Link ; Cooke, Handb. p. 499 p.p. 



Uredospores. Sori amphigenous, scattered, minute, not 

 confluent, orbicular, pallid-brown ; spores subglobose or broadly 

 ellipsoid, echinulate, yellow-brown, 25 — 32x16 — 25 fi, with 

 three germ-pores, each covered by a convex colourless cap. 



Teleutospores. Sori mostly hypophyllous, similar, but more 

 compact and blackish, ^ — frara, diam. ; spores ellipsoid or 



Fig. 87. P. Tanaceti. Teleutospores. 



oblong, more or less rounded at both ends, thickened above (up 

 to 7 fju), delicately verruculose(?) especially in the upper part, 

 rich-brown, 32 — 44x16 — 24 p; pedicels hyaline, thick, per- 

 sistent, as much as 120 /x long. 



On Tanacetum vulgare. Not common. August, September. 

 (Fig. 87.) 



