10 
Mycologia 
On living leaves of Thuja occidentalis, Mellen, Wise., 14 July, 
1908 (Durand no. 6259, type) ; Oconto Co., July, 1909 (Durand 
no. 6910), Dr. J. J. Davis. 
This species differs from K. tetraspora in the 2-spored asci, 
pitted spores, olive h}'menium and the method of rupturing the 
covering epidermis. The fungus attacks the )’oung, living foliage 
so that the scale-like leaves turn brown and die. In old speci- 
mens the ascomata fall out, leaving a hole extending nearly 
through the leaf. The septum in the spore is not always evident 
with low or medium powers of the microscope, but comes out 
best under an oil immersion objective. The same is true of 
the markings of the epispore, which consist of minute pits ex- 
tending about half way through the wall. Such pit-like markings 
are quite unique in either the Phacidiaceae or Stictidiaceae. 
The parasite does not seem to have any visible effect on the 
vigor of the tree, according to Dr. Davis’s observations, since it 
destroys only a limited amount of leaf-tissue. Experience with 
other fungous diseases, however, leads one to suspect that under 
favorable conditions, or in certain seasons, it might become 
serious. 
3. Keithia Tsugae Farlow 
Stictis Tsugae Farlow, Appalachia 3: 245. 1883. 
Propolidium Tsugae (Farlow) Sacc. Syll. Fung. 8: 668. 1889. 
Hypophyllous, numerous, scattered ; ascomata minute, at first 
buried beneath the epidermis which is finally ruptured and turned 
to one side as a scale, becoming more or less elevated and cushion- 
like, dark brown, orbicular to elliptic, .3-5 mm. in diameter. 
Asci oblong-clavate, apex rounded, not blue with iodine, 58-65 
X 13-16 ju. Spores 4, uniseriate, at first hyaline, finally becoming 
greenish brown, ellipsoid-ovoid, divided by one septum into two 
unequal cells of which the proximal is smaller, constricted at the 
septum, 13-16X6-8 /A, smooth. Paraphyses cylindric, septate, 
hyaline below, the tips clavate, olive-brown, 4-5 fi thick. 
On living and dead leaves of Tsuga eanadensis. New Hamp- 
shire: Shelburne and Lake Sunapee, July-Sept., Dr. W. G. Far- 
low; Wisconsin: Price Co., 13 Sept., 1911, Dr. J. J. Davis. 
I have examined a portion of the type of this species kindly 
placed at my disposal by Dr. Farlow, as well as other specimens 
from his collection in the herbarium of the New York Botanical 
