170 
Journal of Mycology 
[Vol. 8 
INTERESTING VARIATIONS IN THE APPENDAGES OF 
PODOSPHAERA OXYACANTHAE (DC.) De B. 
J. G. SANDERS. 
While examining some specimens of the Erysiphaceae col¬ 
lected in October at Newark, O., I found upon leaves of culti¬ 
vated cherry a Podospliaera oxyacanthae with a large proportion 
of the perithecia bearing compound appendages. A few of the 
compound appendages were perfectly developed, but in the ma¬ 
jority of cases one of the branches would be scarcely or not at all 
developed at the apex. The appendages varied in length from one 
to four times the diameter of the perithecia; the branching seem¬ 
ingly not affecting the length, as in two cases of tri-compound ap¬ 
pendages, they were of maximum length with one branch three 
times dichotomously branched at the apex. In only two cases I 
found two asci in one perithecium, which precludes the idea of 
malformation of the perithecia as a cause of the compound ap¬ 
pendages. 
In one slide preparation of about fifty (50) perithecia, the 
following was noted: 
Perithecia bearing one compound appendage.12 
Perithecia bearing two compound appendages.7 
Perithecia bearing three compound appendages. 3 
Perithecia bearing four compound appendages. 1 
Perithecia bearing six compound appendages.1 
Perithecia bearing one tri-compound appendage. 2 
The accompanying fig¬ 
ure, drawn with an Abbe 
camera lucida, amplification 
no diam, shows a perithe¬ 
cium bearing one tri-com¬ 
pound and five bi-compound 
appendages. It, however, 
contained a single ascus and 
the normal number (8) of 
ascospores of normal size. 
The majority of the append¬ 
ages were branched near the 
perithecia, and only a few 
very near the apex, while 
many bore nodules or incipi¬ 
ent branches at various loca¬ 
tions. An examination of 
specimens from several other 
localities, resulted in finding, 
only rarely, a compound 
appendage. 
Botanical Department, Ohio State University. 
