92 
MILDEWS, RUSTS AND SMUTS 
Uredospores and Teleiitospores on Salix repens. 
Melampsora lini, D.C. ; Plowr., Ured., p. 237. 
Uredospores. Sori small, scattered, circular, soon pow¬ 
dery, on the leaves, sepals, etc. ; spores subglobose, echinu- 
late, orange-yellow, 15—25 x 13—16 [jl. 
Teleutospores. Sori more or less circular, brown then 
blackish ; spores formed under the cuticle, somewhat 
cylindrical, polygonal in [section from mutual pressure, 
brownish, 45 X 20 p. 
Syn. Uredo lini, D.C. 
Lecythea lini, Berk. 
On flax— Linnm usitatissimum, and on purging flax— 
Linum catharticum. 
This fungus often proves very destructive to cultivated 
flax. 
Melampsora pinitorqua, Rostrup. 
Pycnidia. Forming minute, yellowish spots on the 
leaves and bark. 
Aecidia. Appear on the leaves and young shoots, 
forming orange patches ; spores subglobose, pale reddish- 
yellow, minutely warted, 15—20 p diam. 
Uredospores. Sori orange-yellow, mostly on the under 
surface of the leaf, also on the young shoots, soon powdery ; 
spores subglobose, elliptic or ovoid, echinulate, orange, 
40^—50 X 16—24 p ; paraphyses with the tip globose. 
Telentospores. Sori on the under surface of the leaves, 
brown then blackish, flattened; spores elongated, tip 
blunt, narrowed downwards, brownish, smooth, 40—50 
X II—14 p. 
The aecidia grow on the leaves and young shoots of Pinus 
silvestris and P. montana. 
The teleutospores occur on poplar leaves— Populus tre- 
mula, P. alba, and P. canescens. The latter is by some con¬ 
sidered as a hybrid between P. tremula and P. alba. 
The synonymy is too intricate to be attempted here. 
CRONARTIUM, Fries 
Aecidia. Produced on conifers, elongated; spores 
produced in chains, orange. 
Uredospores. Sori within a special covering or peridium ; 
spores produced singly. 
Teleutospores. Spores i-celled, compacted into a long 
bristle-like projection, which springs from the middle of the 
uredospore sorus. The spores germinate on the host-plant, 
