320 COLEOSPORIUM 
since the scidia of all of them live on needles of two-leaved 
Pines, it is impossible to say where any given ecidium of this 
class belongs, without culture-experiments. If a Coleosporium 
can be found in the immediate neighbourhood, the xcidium 
may be conjecturally assigned to that. But though the ecidia 
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 only of the two leaves of Pine in each fascicle; this is, 
according to my experience, almost always true of C. Senecionis. 
In others, the peridia occur on both leaves of the fascicle; this 
seems to be the case usually with C. Tussilaginis. Some 
peridia are very bladdery and inflated, others are more flat 
or cylindrical. It may be possible in the future to distinguish 
them by these means, especially since the Coleosporia lend 
themselves easily to artificial cultures; see under C. Rhin- 
anthacearum and C. Tussilaginis. 
1. Coleosporium Senecionis Fr. 
Oredo farinosa var. Senecionis Pers. Syn. p. 218. 
Peridermium Pini Chev.; Cooke, Handb. p. 535 p.p., f. 219; Mier. 
Fung. pl. 2, f. 27, 28 (not the description p. 194). 
P. acicolum Link ; Cooke, Mier. Fung. p. 194. 
Puccinia glomerata (uredospores) Cooke, Handb. p. 500. 
Coleosporium Senecionis Fr. Summ. Veg. Scand. p. 512. Cooke, Micr. 
Fung. p. 218, pl. 7, f 145, 146. Plowr. Ured. p. 248 p.p. Sace. 
Syll. vii. 751. Fischer, Ured. Schweiz, p. 451. Arthur, N. Amer. 
Fi. vii. 94. 
Spermogones. Amphigenous, scattered, conspicuous. 
Micidwospores. Aicidia (Peridermium acicolum) oblong or 
shortly cylindrical, fragile, rupturing irregularly, whitish; spores 
almost all oblong, seldom roundish, densely verrucose, orange, 
25—85 x 15—25 pm. 
Uredospores. Sori hypophyllous, roundish or on the stems 
elongated, soon naked and pulverulent, orange; spores mostly 
oblong, verruculose, 26—31 x 14—17 j; epispore rather thick. 
Teleutospores. Sori hypophyllous, forming little red crusts ; 
spores prismatic, length up to 100u, breadth 18—244; epispore 
at summit up to 22 w thick. 
