ON CAMPANULACE 159 
cinnamon ; spores globose to ellipsoid, echinulate, yellow-brown, 
24—29 x 16—25 yw, with two germ-pores. 
Teleutospores. Sori similar and often on the stems, but 
dark-brown; spores ellipsoid or somewhat 
ovate, rounded and not thickened above, 
scarcely constricted, usually rounded 
below, very delicately verruculose, brown, 
25—40 x 16—24 w; epispore thin ; pedi- 
cels hyaline, usually very short. 
Fig. 110. P. Hieracii. 
On leaves and stalks of Hieracium, Enon 
H. boreale, H. murorum, H. Pilosella, H. umbellatum and 
various subspecies. Wery common. May—November. (Fig. 
110.) 
It was proved by Jacky that this species, which occurs so abundantly 
on Hieracium, cannot be transferred to other genera of Composite. Asa 
similar fact has been demonstrated for many other species of Uredinales, 
there is sufficient ground for the assumiption, now generally made, that 
most species of Puccinia, etc., which are parasitic on different genera 
should be regarded as distinct, even when no experimental evidence exists 
in favour of that course. Jacky was also inclined to suspect that 
P. Hieracii might hereafter be divisible into a number of biologic races, of 
which, however, he only indicated one, that on ZH. villosum belonging to 
the section Pilosella. René Probst (Centralbl. f. Bakt. 1909, 2. xxii. 676) 
not only divided P. Hieraciz into 13 biologic races, arranged under two 
subspecies, P. Piloselloidarum on the section containing H. Pilosella and 
its allies, and P. Hieracii (sens. strict.) on the other species, forming the 
section Euhieractwm,—but he goes on to reduce the question of such 
races to an absurdity by “proving” that one of them was restricted to a 
mere form of a variety of a subspecies (Hieracium Pilosella, subsp. 
vulgare, var. genuinum, forma subpilosum). 
The two subspecies may perhaps be defensible, if they are distinguished 
morphologically, as Probst states, by the fact that in P. Piloselloidarum 
the germ-pores of the uredospore are strictly equatorial, but in P. 
Hieractt they are removed towards the upper pole. 
DistrisuTion: Europe, Asia Minor, North America, Chili. 
33. Puccinia Campanule Carm. 
Puccinia Campanulae Carmich. in Berk. Engl. Fl. v. 365. Cooke, 
Handb. p. 498; Micr. Fung. p. 205. Plowr. Ured. p. 200. Sace. 
Syll. vii. 677. Sydow, Monogr. i. 196, f. 182. Fischer, Ured. 
Schweiz, p. 175, f. 136. 
