MILDEWS, RUSTS AND SMUTS 
47 
PHYLLACTINIA, Lev. 
Perithecia large, globose or depressed; appendages 
springing from the equatorial region of the perithecium, 
simple, rigid and spine-like, with a swollen base ; asci 
many, 2-, rarely 3-spored. 
jMarked b}^ the straight, simple appendages, furnished 
with a much swollen base. A dense mass of branched 
structures are present at the tip of the ascus. 
Phyllactinia coryiea, Karst. Mycelium often soon dis¬ 
appearing, sometimes more or less persistent, generally on 
the under surface of the leaves ; perithecia generally scat¬ 
tered, large, more or less flattened, 140—170 p diam., 
sometimes larger; appendages equatorially situated, 5—18, 
rarely more, i—3 times as long as the diameter of the 
perithecium, straight, rigid, colourless, with a hollow, much 
swollen base ; tip of perithecium covered with a dense mass 
of outgrowths from the cells of the perithecium, each stalk 
or outgrowth is terminated by a brush-like tuft of slender 
branches ; asci 5—45, subcylindrical or broadly oblong, 
2-, rarely 3-spored; spores variable in form and size 30—42 
p, smaller when 3 are present. 
Syn. Erysiphe guttata, Fries. 
Phyllactinia guttata, Lev. 
The fungus grows on numerous different kinds of plants, 
as species of Acer, Alnus, Coryhis, Berheris, Angelica, 
Buxus, Fagus, etc. 
Salmon points out that the function of the curious out¬ 
growths from the tip of the perithecium, is to anchor or hx 
down this structure when it turns upside dovm on the leaf, 
by becoming mucilaginous. 
ERYSIPHE, D.C. 
Perithecia globose or depressed ; asci several, 2—8- 
spored ; appendages without any definite branching at the 
tip, simple or irregularly branched, generally more or less 
like the mycelium and mixed with it, sometimes almost or 
quite absent. 
Distinguished by the vague appendages, which more or 
less resemble the mycelium. Differing from Sphaerotheca, 
which also has somewhat similar appendages, by having 
more than one ascus in the perithecium. 
