230 PUCCINIA 
or oblong groups, between cylindrical and cup-shaped, with a 
white torn recurved margin; spores delicately verruculose, 
orange, 16—24 p. 
Uredospores. Sori amphigenous or on the stems, distributed 
irregularly, minute, roundish, long covered by the epidermis, 
brown ; spores globose to broadly ellipsoid, verruculose, yellow- 
brown, 20-—28 p, with four or five germ-pores. 
Teleutospores. Sori similar, but more compact, brown-black ; 
spores oblong to clavate, generally rounded above and slightly 
thickened, hardly or not at all constricted, rounded or attenuated 
below, smooth, uniformly brown, 35—54 x 16—24,; pedicels 
brownish, thick, not very persistent, short or as much as 95 w 
long; a few mesospores intermixed. 
On Thesium humifusum. Rare; Surrey, Dorset, Wilts., 
Hants., Cambs., ete. Aicidia, May—August (also recorded for 
October); teleutospores, August—October. (Fig. 177.) 
It was maintained by Vuillemin (Bull, Soc. Myc. France, 1894, p. 
107 ff.) that this species has no xcidium-stage, the Heidiwm Thesit being 
referred by him to another species, P. Desvauwit (= P. Passerinii), 
distinguished by its broader and warted teleutospores ; but both Sydow 
and Fischer have disproved this contention. The ecidia are rather more 
common than the teleutospores, and are sometimes found among the 
teleuto-sori on the same leaf, in October. 
DISTRIBUTION: Europe, Eastern Siberia. 
100. Puccinia Iridis Wallr. 
"redo Iridis DC. Encyel. viii. 224. Plowr. Ured. p. 257. 
Trichobasis Iridis Cooke, Micr. Fung. p. 227. 
Puccinia Iridis Wally. in Rab, Krypt. Fl. ed. i. p. 23 (1844). Plowr. 
Ured. p. 189. Sace. Syll. vii. 657. Sydow, Monogr. i. 598. 
Fischer, Ured. Schweiz, p. 236, f. 186. 
P. truncata B. and Br. Ann. Nat, Hist. ser. 2, xiii, 461 (1854). Cooke, 
Handb. p. 494 ; Micr. Fung. p. 208. 
Uredospores. Sori amphigenous, solitary or somewhat 
aggregated, roundish or elongated, minute, long covered by the 
epidermis, not pulverulent, reddish-brown; spores globose to 
