DESCRIPTIONS OF THE SPECIES 
135 
55. A. Sandersoni. Frond three to six inches long, one-half to 
three-quarter inch broad, proliferous at the apex. Pinnae stalked, 
with three to five blunt lobes. ' Rachis green. 
56. A. trichomanes. Frond four to eight inches long, half-inch 
broad ; pinnae almost round, sessile, minutely toothed. Rachis 
black, not margined. 
57. A. platy neuron. Frond three to fifteen inches long, one-half to 
one and a half inches broad ; pinnae sessile, ovate, or oblong, often 
auricled, serrate ; rachis black, not margined. Sori several on 
each side of the mid-rib. 
58. A. monanthes. Frond one to two feet long, one-half to one 
and a half inches broad ; pinnae almost sessile, rhomboidal. Sori 
solitary along the lower edge. Rachis black, naked. 
tt Frond pinnate or two to three-pinnate, herbaceous, not more than 
three inches broad. 
59. A. lunulatum. Frond one-half to two feet long, three-quarters 
to three inches broad; pinnae entire or pinnate in the different 
varieties. Rachis edged with green, glabrous. Sori on both sides 
the mid-rib. 
Vars. a. lunulatum. Pinnae one-half to three-quarter inch long, 
crenate, blunt, rhomboidal. Frond two to three feet 
long, proliferous. 
/ 3 . minor. Pinnae as in var. lunulatum , but smaller. Frond 
six to nine inches high, proliferous. 
y. erectum. Pinnae one inch long, half-inch broad, acute, 
deeply toothed. Frond two to three feet long, pro- 
liferous. 
S. Zeyhe 7 'i. Pinnae obtuse, cut below to near the mid-rib 
into rounded toothed lobes, deeply toothed above, not 
proliferous. 
e. gracile. Pinnae fully pinnate, with cuneate, toothed, or 
lobed pinnules. Frond one to two feet long, two to 
four inches broad, not proliferous. 
60. A. varians. Frond three to eight inches long, one and a half 
to two inches broad, two-pinnate, with flabellate, toothed, rounded 
pinnules. Sori in the pinnules. 
61. A. Eylesii. Frond deltoid, three inches long, pubescent, two- 
pinnatifid. 
62. A. pumilum. Frond deltoid, six inches long, glabrous. 
63. A. Gueinzianum. Frond nine inches long, one and a half 
inches broad ; pinnae rhomboidal, cut away below, three-quarter 
inch long ; cut to a widely winged mid-rib into several flabellate, 
bifid lobes. Sori sub-parallel with the mid-rib. 
