1910] THAXTER—CHILEAN FUNGI 439 - 
lonia rubra near the Lago Argentina in Patagonia, and very kindly 
communicated to me by Dr. Necer. The spiral twisting of the 
appendages in this form, although distinct, is, however, more or 
less indefinite and decidedly irregular. A somewhat similar 
tendency is also seen in other species of Uncinula, and a variety on 
poplar of the common U. salicis has been distinguished as U. 
heliciformis by E. C. Hower, owing to a similar though slight 
tendency to the production of a terminal spiral in the appendages. 
It seems certain, however, that no species of Uncinula hitherto 
described could be interpreted with sufficient liberality to include 
this antarctic form which may be characterized as follows: 
Uncinula Nothofagi, nov. sp.—Epiphyllus vel rarius amphi- 
genus: peritheciis mycelio albido persistenti effuso insedentibus, 
dense congestis vel discretis, globoso-depressis, 80 diam. (7o- 
100 #), rufo-brunneis, cellulis 1o-20 » diam.: appendicibus 
5-15, aseptatis, 70-100 # longis, inferne rectis vel curvatis, rigidis, 
induratis, brunneo-suffusis; superne spiraliter arcte 4-8 convolutis, 
apice helicoideo-subinflatis, spiris basalibus plus minus suffusis, 
ceteris hyalinis: ascis late ovalibus, 5-8 in quoque perithecio, 
suboctosporis; sporidiis oblongo-ellipsoidiis 18-2010 #: coni- 
diis subcylindraceis, 25-32 X 10-15 H. 
In foliis Nothofagi antarcticae var. bicrenatae, Taphrina occupatis vel rarius 
eis in folia sana migrans. Punta Arenas, Magellanes, Chile. 
Much to my surprise, the Uncinula above described proved to 
be not the only species having this peculiar habitat, and among 
the small shrubby trees of NV. bicrenata which grow to the south of 
the town in the califate pastures, I several times encountered a 
very different species, always on leaves attacked by the Taphrina. 
This form was decidedly rare and only a small amount of material 
was obtained by diligent searching. The two species were easily 
distinguished with a, hand lens, the large perithecia of the second 
form being sparingly produced, its long irregularly flexed append- 
ages, which in many perithecia are undeveloped, lacking the spiral 
coils of its ally and ending in an open hook, or half-helix, 
more or less characteristic in contour, and recalling the tip of a 
golf stick or the curved handle of an umbrella (fig. 12). In general 
these appendages are decidedly more than twice as long as the 
