104 AMERICAN FERN JOURNAL 
alopsora Cheilanthes (Peck) Arth. Near Grinnell Gla- 
cier Cryptogramma Stelleri was found in association with 
C. acrostichoides. 
Athyrium Filixz-femina (L.) Roth. (A. cyclosorum 
Rupr.) The most common fern of the Park, found near- 
ly everywhere in the wooded regions; most abundant in 
deep moist woods or thickets, but occurring also in thin 
woods, along streams, in swamps, and on moist open 
slopes. Probably nine-tenths of the ferns seen in the 
Park are of this species. In deep woods they often form 
a dense continuous undergrowth of large interlacing 
fronds, and on wet slopes, among alder thickets, the 
plants often cover the ground to the exclusion of most 
other vegetation. The lady fern is so abundant that — 
one soon comes to look upon it as a weed and to have 
scant regard for any attractive features it may possess. 
In favorable situations the fronds are often five feet high. 
They vary greatly in shape and breadth. In shade they 
are bright green, but in open places they have a yellow- 
ish tinge. In the open the fronds are held more stiffly 
erect than in protected places. The sori, also, vary con- 
spicuously in form; usually they are merely curved, but 
those of some plants are horseshoe-shaped. Many of 
the leaves are covered in late summer with irregular dark 
spots, which are probably caused by some fungus. The 
lady fern is often associated with the oak fern, male fern, 
lace-flower (Tiarella), arnicas, twisted-stalk, and red 
baneberry. 
Athyrium americanum (Butters) Maxon. Frequent 
above timber line; on open grassy slopes, along brooks, 
on rock slides, and sometimes in cliff crevices. This 
species is very unevenly distributed; in some piaces 
above timber line it is very abundant, in others rare, 
and in many places absent. It is perhaps the finest fern 
of the region, and one of the most conspicuous. The 
fronds are usually about a foot high, and they form mass- 
