174 
MILDEWS, RUSTS AND SMUTS 
On leaves of Ruhus fruticosus, R. hirtus, R. thyrsoideus, 
R. discolor, R. hiirons, and probably on all our brambles. 
Europe generally. 
Differs from Phragmidmm rubi, Winter, which also 
occurs on brambles, in the absence of a long, colourless 
spine at the tip of the teleutospore. 
Phragmidium rubi. Winter ; Plowr., Ured., p. 224. 
Aecidia and Uredospores similar to those of P. violaceum. 
Telentospores. Sori as a rule on the under surface of the 
leaf, small, scattered, black ; spores cylindrical, tip rounded 
and terminated by a long, colourless spine, coarsely warted, 
a few small warts are sometimes present on the spine at the 
tip, 5 —7-septate, brown, 80—130 x 25-—36 p, pedicel long, 
stout, much swollen at the end. 
Syn. Puccinia nibi, Pers. 
Phragmidium incrassatum, Link. 
Phragmidium bulbosum, vSchl. 
On leaves of Rubus fruticosus, R. caesius, R. saxatilis, R. 
thyrsoideus, and probabh/” on most of our brambles. Europe, 
United States, Jamaica, India. 
Phragmidium subcorticatum, Winter ; Plowr., Ured., p. 
224. 
Aecidium. Sori on the under surface of the leaves, or 
often on the petioles or stem, where they form large, powdery 
orange-yellow patches ; spores subglobose or ovate, min¬ 
utely echinulate, orange-yellow, 18—30 x 14—21 p. 
Uredospores. Sori soon powdery, yellowish-orange, often 
growing into each other and forming large patches ; spores 
globose or broadly elliptical, echinulate, yellow, 18—35 
X 15—25 p. 
Telentospores. Sori small, black, usually scattered over 
the entire surface of the leaf ; spores cylindrical, tip with a 
rather long, colourless point, rattier coarsely warted, 
5—9-septate, dark brown, 80—150 x 25—35 p, cells with 
four germ-pores, pedicel long, swollen at the base. 
Syn, Uredo e'ffusa, Grev. 
Uredo aurea, Purton. 
Aregma mucronatum, Fr. 
Phragmidium mucronatum, Fr. 
Phragmidium bullatum, Westend. 
On leaves and stems of Rosa canina, R. centifolia, R. 
arvensis, and on many kinds of cultivated roses. Europe, 
Syria, Persia, Natal, N. America, Jamaica, India. 
This parasite often proves injurious to cultivated roses, 
