320 COLEOSPOMUM 



since the secidia of all of them live on needles of two-leaved 

 Pines, it is impossible to say where any given a'cidium of this 

 class belongs, vvithoul culture-experiments, [f a Goleosporiwm 

 can !»• found in the immediate neighbourhood, tin' aecidium 

 may be conjecturally assigned in that. But though the gecidia 

 are very much alike, there are certain differences to be seen, 

 although nothing is yet known about their constancy as specific 

 characters. In certain cases nearly all the peridia will be found 

 on one <>n/;/ of the two leaves of Pine in each fascicle; this is, 

 according to my experience, almost always true of G. Senecionis. 

 In others, the peridia occur on botJi leaves of the fascicle; this 

 seems to be the case usually with C. Tussilaginis. Some 

 peridia are very bladdery and inflated, others are more Hat 

 or cylindrical. It may be possible in the future to distinguish 

 them by these means, especially since the Goleosporia lend 

 themselves easily to artificial cultures; see under G. Rhin- 

 anthacearum and C. Tussilaginis. 



1. Coleosporium Senecionis Fr. 



Credo farinosa var. Senecionis Pers. Syn. p. 218. 



Peridermium Pini Chew ; Cooke, Handl). p. 535 p.p., f. 219; Micr. 



Fung. t)l. 2, f. 27, 28 (not the description p. 194). 

 /'. acicolum Link ; Cooke, Micr. Fung. p. 194. 

 Puccinia glomerata uredospores) Cooke, Handb. p. 500. 

 Coleosporium Senecionis Fr. Summ. Veg. Scand. p. 512. Cooke, Micr. 



Fung. p. 218, pi. 7, f. 145, 146. Plowr. Ured. p. 248 p.p. Sacc. 



Syll. vii. 751. Fischer, Ured. Schweiz, p. 451. Arthur, X. Amer. 



Fl. vii. 94. 



Spermogones. Amphigenous, scattered, conspicuous. 



sEcidiospores. vEciclia (Peridermium acicolum) oblong or 

 shortly cylindrical, fragile, rupturing irregularly, whitish; spores 

 almost all oblong, seldom roundish, densely verrucose, orange, 

 25—35x15—25/*. 



U 'redospures. Sori hypophyllous, roundish or on the stems 

 elongated, soon naked and pulverulent, orange ; spores mostly 

 oblong, verruculose, 20 — 31 x 14 — l7,u; epispore rather thick. 



Teleutospores. Sori hypophyllous, forming little red crusts ; 

 spores prismatic, length up to 100/z, breadth 18 — 24p ; epispore 

 at summit up to 22/x thick. 



