ON COMPOSITE 



139 



12. Puccinia tinctoriae Magn. 



Puccinia Compositarum var. Serratulae Cooke, Exsicc. no. 33. 



P. tinctoriae Magn. in Abhand. Nat. Gesell. Niirnberg, 1900, xiii. 37 ; 



Ber. deutsch. Bot. Gesell. 1893, pi. 21, f. 27—8. Sydow, Monogr. 



i. 150, f. 127. 



Uredospores. Sori amphigenous, on inconspicuous pallid 

 spots, scattered, minute, roundish, pulverulent, dark-cinnamon ; 

 spores globose to ellipsoid, echinulate, brown, 24 — 40 x 19 — 26 /*; 

 epispore with two germ-pores towards the summit. 



Fig. 91. P. tinctoriae. Teleutospores and uredospore (from 

 Cooke's specimens). 



Teleutospores. Sori similar, but blackish ; spores ellipsoid 

 to oblong, rounded at both ends, not thickened above, hardly 

 constricted, delicately verruculose, brown, 27 — 60x19 — 30 yu,; 

 pedicels hyaline, up to 14^ long; epispore thin. 



On leaves of Serratula tinctoria. Apparently very uncom- 

 mon ; Belton Wood, Highgate (M. C. Cooke). Teleutospores, 

 July — September. (Fig. 91.) 



Distribution: France, Sweden, Germany, Austria, Italy, 

 Siberia. 



13. Puccinia Centaureae DC. 



Puccinia Compositarum Scb. ; Cooke, Handb. p. 499 ; Micr. Fung. 



p. 206 p.p. 

 P. Centaureae DC. Flor. fr. vi. 595. Cooke, Micr. Fung. p. 207. 



Plowr. Ured. p. 186. Sydow, Monogr. i. 39. Fischer, Ured. 



Schweiz, p. 222, f. 174—5. 



