230 puccin] \ 



or oblong groups, between cylindrical and cup-shaped, with a 

 white born recurved margin; spores delicately verruculose, 

 orange, 16 — 24^. 



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 fi, 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 — 54x16 — 24 //. ; pedicels 

 brownish, thick, not very persistent, short or as much as 95 //, 

 long ; a few mesospores intermixed. 



On Thesium hv/mifusum. Rare; Surrey, Dorset, Wilts., 

 Hants., Cambs., etc. ^Ecidia, May — August (also recorded for 

 October); teleutospores, August — October. (Fig. 177.) 



It was maintained by Vuillemin (Bull. Soc. Mye. France, 1894, p. 

 107 ff.) that this species has no aecidiuni-stage, the Mcvdium Thesii being 

 referred by him to another species, P. Desvauxii (= P. Passerinii), 

 distinguished by its broader and warted teleutospores ; but both Sydow 

 and Fischer have disproved this contention. The secidia 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. 



Uredo Iridis DC. Encycl. viii. 224. Plowr. Ured. p. 257. 



Trickobasis Iridis Cooke, Micr. Fung. p. 227. 



Puccinia Iridis Wallr. in Rab. Krypt. Fl. ed. i. p. 23 (1844). Plowr. 



Ured. p. 189. Sacc. 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. 203. 



Uredospores. Sori amphigenous, solitary or somewhat 

 aggregated, roundish or elongated, minute, long covered by the 

 epidermis, not pulverulent, reddish -brown; spores globose to 



