his 



IMCCINIA 



the fusiform shape, thin walls, and pale colour of the teleutospores, which 

 often become totally devoid of thickening al tin- apex, by the dropping off 

 of the pale thickening cap, ou germination. /'. punctata is additionally 

 distinguished by the presence of the aecidium. 



Fischer explains the fact, that distortions more usually accompany 

 /'. Valantiae, by the consideration that infection takes place from the 

 basidiospores mainly through the cuticle of young ami still growing parts, 

 while teleuto-sori of P. punctata ami /'. C't'/akoeslya/,a are produced by 

 infection from spores whose germ-tubes can penetrate the stomata of 

 parts of the plant which are already fully developed. The relations 

 between the three species are very like those which subsist between 

 Uromyces Trifolii-repentis, U. Trifolii, and U. flectens. 



Distribution : Europe, North America. 



40. Puccinia difformis K. et S. 



Puccinia diffomiis K. et S. Myk. Heft. i. 71 (1817). Cooke, Handb. 



p. 501 : Micr. Fung. p. 208. 

 P. Galii Plowr. Ured. p. 144 p.p. 

 P. ambigua Lagh. in Sydow, Uredineen, no. 1056 (1897). Sacc. Syll. 



xvi. 288. Sydow, Monogr. i. 216. 



jEcidiospores. /Ecidia hypophyllous, on yellow spots, soli- 

 tary or irregularly disposed over the 

 whole leaf, whitish-yellow, with torn 

 rerlexed margin ; spores verruculose, 

 orange, 13 — 25 fx. 



Teleutospores. Sori hypophyllous 

 or on the stems, small, elliptic, soli- 

 tary or clustered, on the stems often 

 elongated and confluent, long covered 

 by the ash-coloured epidermis, then 

 naked, firm, black ; spores ellipsoid to 

 clavate, much thickened above, hardly 

 constricted, tapering below, smooth, 

 brown above, paler downwards, 35 — 



55 x 15 — 25 fx ; pedicels brownish, persistent, as long as the 



spore or longer. 



On Galium Aparine. July — August. Surrey, Kent. (Fig. 

 118.) 



Fig. 118. P. difformis. 

 Teleutospores. 



