ON COMPOSITE 141 
spores globose to ellipsoid, delicately echinulate, yellow-brown, 
22—30 x 19—24 y, with two germ-pores. 
Teleutospores. Sori amphigenous and on the stems, scattered, 
minute, punctiform, pulverulent, 
blackish-brown ; spores broadly ellip- 
soid, rounded at both ends, not 
thickened above, not constricted, 
very delicately verruculose, chestnut- 
brown, 830—35 x 22—27 w, sometimes 
longer ; pedicels hyaline, short. 
eon y , Fig. 93. P. Cyani. 
On Centaurea Cyanus. Not un- ii cae 
common in gardens. June—September. (Fig. 93.) 
There is a similar species, P. montana, which occurs on the continent 
on Centaurea montana ; it is distinguished by the much coarser warts of 
the teleutospores, which are also relatively longer. Both these species, 
like P. obtegens, permeate the whole plant with the mycelium of the 
primary uredospores, but such infested plants of Centaurea can flower 
freely, while those of Cirsiwm arvense never do. The mycelium of the 
secondary uredospores, mixed with teleutospores, is more strictly localised. 
DisTRIBUTION: Western and Central Europe. 
15. Puccinia Carduorum Jacky. 
Puceinia Hieracit Plowr. Ured. p. 185 p.p., see also p. 216. 
P. Carduorum Jacky, Composit.-Puccin. p. 58, Sacc. Syll. xvi. 297. 
Sydow, Monogr. i. 33. 
Uredospores. Sori generally hypophyllous, on very indis- 
tinct spots, scattered, minute, pulverulent, cinnamon; spores 
globose or subglobose, densely echinulate, pale-brown, 22—28 p, 
with three germ-pores. 
Teleutospores. Sori similar, but dark-brown; spores variable, 
oblong to ovate, rounded above, not thickened, hardly at all 
constricted, rounded below, verruculose, brown, 25—88 x 17— 
24 4; epispore thin; pedicels hyaline, short. 
On Carduus crispus, C. nutans. Not common; Yorkshire, 
Clare Island, etc. 
