ee ON COMPOSITE 143 
22—28 x 19—24 yu, with three more or less equatorial germ- 
pores each provided with a thickening. 
Fig. 94. P. Cirsii. Teleuto- Fig. 95. P. Cirsti. Teleuto- 
spores, on C. palustre, from spore and uredospore, on 
Hereford. C. lanceolatum. 
Teleutospores. Sori mostly hypophyllous only, similar, but 
blackish-brown or black ; spores ellipsoid or somewhat obovate, 
rounded at both ends, not thickened above, hardly constricted, 
verruculose or merely punctate, chestnut-brown, 25—88 x 
17—25 «; epispore thin ; pedicels hyaline, very short: 
On Cirsium, Dupplin Castle, Perth (M. C. Cooke). On 
C. pratense, Ballyquirke Lake, Co. Galway (communicated by 
J. Adams); Earlswood Lakes, near Birmingham. On C. palustre, 
Hereford, Seckley Wood, Barnt Green, etc. Uredospores from 
March; teleutospores, June—November. (Figs. 94, 95.) 
There is no mention of this in Plowright’s Uredines, or in the Trans. 
Brit. Myc. Soc. (Plowright’s list), but it is probably not uncommon. It 
occurs frequently on the radical leaves, and can be easily distinguished 
from P. Cnict-oleracex by the presence of the uredospores and the non- 
circinate teleuto-sori, as well as by the absence of the apical thickening. 
Fischer records it from Switzerland on many species of Cirstwm (but not 
on those mentioned here), and also assigns to it spermogones on the upper 
leaf-surface and petiole ; I have not been able to find any trace of these in 
our British specimens. The uredospores, seen in water, sometimes 
appear quite smooth, as Cooke describes them. The teleutospores have 
the upper pore at the summit or at the side, the lower pore just beneath 
the septum or lower down; they are at times faintly granulated, at others 
distinctly verruculose. Mesospores are rare. 
T have also a number of specimens on C. lanceolatum from Droitwich, 
Wyre Forest, etc., bearing a great similarity to P. Cirsit-lanceolati Schrot., 
but the differences from P. Cirsit are so slight and elusive that, as the eecidial 
stage by which the former is distinguished has not yet been found in 
Britain, it is better for the present to place them under P. Cirsiv. 
DisTRiBuTION: Europe, Siberia, Japan, North America. 
