440 BOTANICAL GAZETTE [DECEMBER 
diameter of the perithecium (fig. 11), quite hyaline, their outline 
somewhat uneven with an occasional slight irregular swelling. 
The perithecia which almost always occur on the upper side of the 
leaf, as far as I have seen, are much larger than those of U. Notho- 
fagi, and contain many more (10-20) asci, each with three or four 
spores instead of eight. Since it does not seem possible to refer 
this form to any of the described species of Unainda it may be 
characterized as follows: 
Uncinula magellanica, nov. sp.—-Plerumque ephiphyllus. Peri- 
theciis mycelio albido effuso exiguo insidentibus, discretis vel 
subgregariis, globoso-depressis, opacis vel subopacis, atro-brunneis, 
130 # (90-150 #) diam., cellulis 10-20  latis; appendicibus 10-22, 
hyalinis, longis, tenuibus, curvatis vel subflexuosis, subrigidis, 
225-400 5-6 @, apice subinflatis et subrecurvatis: ascis late 
clavatis, 55X25, plerumque 3-4 sporis, sporidiis 2010-12 #: 
conidiis subcylindraceis, 35-40 15-18 p. 
In foliis Nothofagi antarcticae var. bicrenatae, Taphrina obsessis. Punta 
Arenas, Magellanes, Chile. 
Three other species of Erysipheae were also found in the neigh- 
borhood of Punta Arenas. Of these a form, encountered but once 
on a species of Galium, appears to be Erysiphe Chicoracearum; 
while another not uncommon on several Compositae does not 
seem to differ from Sphaerotheca fuliginea. The third, however, is 
quite remarkable on account of its habitat; since, like the two 
species of Uncinula just described, it appears to be invariably 
associated with another fungus. Toward the end of February I 
noticed that the distortions on Berberis buxifolia caused by Aecidium 
magellanicum were assuming a whitish appearance from the invasion 
of an Oidiwm that covered the leaves and twigs which were attacked 
by the rust; and early in March it was almost impossible to find 
a specimen that was not more or less completely covered by it. 
I looked in vain for perithecia, however, and it was not until the 
very last days of my stay (March 10) that I was able to obtain a 
rather scanty supply of leaves bearing scattered perithecia, many of 
which were fully matured. The latter proved to belong to 4 
species of Microsphaera which I am unable to distinguish from M. 
