MILDEWS, RUSTS AND SMUTS 
179 
Syn. Puccinia elymi, West end. 
Puccinia triarticulata, Berk, and Curt. 
On leaves of Elymus arenarius. Belgium, Denmark, 
United States. 
I met with this species some years ago on Elymus arena- 
rhis at Palling in Norfolk, in August. 
COLEOSPORIUM, Lev. 
Pycnidia. Orange, minute, somewhat conico-depressed. 
Aecidia. In some species of two forms, one elongated, 
the other short. 
Uredospores. Sori yellow, spores produced in chains, 
warted or minutely spiny. 
Teleutospores. Sori foiming flat, waxy, yellowish crusts ; 
spores transversely 3-septate, each cell has one germ-pore ; 
germination by a promycelium bearing a single promy¬ 
celium spore at its tip. 
Some species are heteroecious, others not. Some prove 
injurious to forest trees. 
Coleosporium senecionis, Fries ; Plowr., Ured., p. 251. 
Pycnidia. Yellow, minute, scattered. 
Aecidia. On the leaves the peridia are cylindrical; on 
the bark, larger and irregular in form, often crowded, 
peridia whitish ; spores in chains, globose or irregularly 
angular, orange, warted, 30—^40 p,. 
Uredospores. Sori reddish-yellow, soon pale and pow¬ 
dery ; spores in short chains, soon becoming free and 
powdery, elliptical or subcylindrical, warted, 25—40 x 
15—25 [L. 
Teleuto spores. Sori forming slightly convex, waxy 
crusts, yellowish-red, then deep red ; spores cylindrical 
or somewhat club-shaped, tip flattened, generally 4-celled, 
brownish-orange, 80—no x 20—35 p, smooth. 
Syn. Aecidium pini, Pers. 
Peridermium pini, Wallr. 
Trichohasis senecionis, Berk. 
Coleosporium senecionis. Fries. 
Puccinia glomerata, Cooke. 
The uredospores and teleutospores are parasitic on 
groundsel— Senecio vulgaris ; ragwort— Senecio jacohaea, 
and on other species of Senecio, as S. viscosa, S. silvatica, 
S. palustris, etc. 
Pycnidia and aecidia grow on the leaves and bark of the 
Scots fir— Pinus sylvestris, P. maritima, P. insignis, P. 
strobus, ere. 
