146 
MILDEWS, RUSTS AND SMUTS 
The aecidia occur on the barberry— Berheris vulgaris 
and Mahonia ilicifolia in this country, also on many other 
species of Berheris and Mahonia elsewhere. 
The uredospores and teleutospores occur on species of 
Agrostis, Agropyrum, Air a, Alopecurus, Arrhenatherum, 
A vena, Br achy podium, Briza, Bromus, C alamo grostis, Cy- 
nodon, Dactylus, Elym-us, Festuca, Holcus, Hordeum, 
Milium, Folium, Molinia, Koeleria, Panicum, Poa, Phleum, 
Secale, Triticum, and other genera of grasses. 
This fungus constitutes the dreaded “ rust ” of wheat, 
which does injury to the amount of several millions of pounds 
sterling annually, throughout the world. Eriksson has 
shown that several forms of this species have become 
what are termed “ biologic species,” that is, they can only 
infect certain species of host-plants. 
Britain, Europe, Africa, Asia, Australia, N. and .S. 
America. 
Puccinia coronata, Corda ; Plowr., Ured., p. 163 (in part). 
Aecidia. On the under surface of the leaf, or on the 
leafstalks, on yellow or purplish-yellow spots, rounded or 
irregularly scattered, distorting the leaves and more es¬ 
pecially the leafstalks, cylindrical, edge recurved, torn, 
white ; spores angularly globose, very delicately warted, 
orange, 15—25 x 14—20 p. 
Uredospores. Sori on the under surface of the leaves, 
scattered or in lines, often growing into each other, minute, 
more or less oblong, powdery, orange; spores globose, 
subglobose or ovate, echinulate, yellow, 20—30 X 16— 
24 [ji, with three or four germ-pores; a few paraphyses are 
intermixed. 
Teleutospores. Sori on the under surface of the leaf, 
generally irregularly scattered, sometimes clustered, oblong 
or narrow, for a long time covered by the epidermis, then 
naked, black ; spores club-shaped, tip flat and bearing 
small outgrowths or blunt spines, not at all, or very slightly 
constricted at the septum, base narrowed, smooth, brown, 
35—60 X 18—25 p, pedicel short, rather thick. 
Syn. Aecidium crassum, Pers. 
Aecidium rhamni, Gmel. 
Aecidium frangulae, Schum. 
Uredo coronata, Erikss. and Henn. 
Aecidia on Rhamnus frangulae. 
Uredospores and teleutospores on Agrostis alha, A. 
stolonifera, A. vulgaris, Calamagrostis arundinacea, Holcus 
mollis, H. lanatus, Phalaris arundinacea, Triticum repens. 
