FERNS OF GLACIER PARK 109 
woods. Most of the plants seen were sterile. The spe- 
cies is well distributed about Belton and Lake McDon- 
ald, but it does not appear to extend to much higher 
elevations. 
Lycopodium clavatum monostachyon Hook. & Grev. 
Seen only at Johns Lake, where it is very abundant in 
moist thickets just outside the sphagnum bog. It is a 
handsome plant, very different in color and form from 
our other species. 
SELAGINELLACEAE 
Two species besides those listed below occur in the 
Park. The plants are found in open places nearly every- 
where on the east slope, at all altitudes, and they occur 
in greater abundance than in any region known to the 
writer. Species of Selaginella are rare or absent on the 
west slope. 
Selaginella Wallacei Hieron. Common or abundant 
at low and middle altitudes, and sometimes above tim- 
ber line, on open, grassy or rocky slopes, on dry hilltops, 
and in dry meadows. 
Selaginella densa Rydb. Common at low altitudes, 
especially on prairie. On the dry, rocky flats about St. 
Mary this is one of the most common plants, densely 
covering large areas of ground. 
EQUISETACEAE 
Equisetum sylvaticum L. Rare on the east slope, 
found only in a boggy place in woods at the edge of 
Lake Josephine, growing with E. variegatum; occasional 
on the west slope at middle altitudes in boggy places in 
woods. Very different in appearance from any other 
Species; sometimes forming dense tangled masses. 
Equisetum arvense L. Common, and often abundant, 
at nearly all altitudes except the highest; in wet meadows 
or thickets or along streams and lake shores; frequent on 
rocky slopes or in wet gravelly meadows above timber 
