24 POLYPODIACEAE. 
5. Asplenium Trichomanes [, Maiden- 
hair Spleenwort. (Fig. 50.) 
Asplenium Trichomanes I,. Sp. Pl. 1080. 1753. 
Rootstock short, nearly erect, chaffy with blackish 
scales. Stipes densely tufted, commonly numerous, 
1/-5’ long, purplish-brown and shining; leaves linear 
in outline, 3’-8’ long, 6’’-10’’ wide, rather rigid, once 
pinnate, evergreen ; pinnae oval or roundish-oblong, 
inequilateral, partly opposite, partly alternate, or 
nearly all opposite, cuneate at the base, the point of 
attachment to the dark brown rachis narrow, their 
margins slightly crenate ; sori 3-6 on each side of the 
forking and evanescent midrib, short, narrowed at 
either end ; sporanges dark brown when mature. 
On rocks, preferring limestone, throughout nearly 
the whole of North America except the extreme north. 
Ascends to 2500 ft. in Vermont. Also in Europe, Asia, 
South Africa ‘and the Pacific Islands. July-Sept. 
6. Asplenium viride Huds. Green Spleen- 
wort. (Fig. 51.) 
Asplenium viride Huds. Fl. Angl. 385. 1762. 
Rootstock stout, creeping, chaffy with brown nerve- 
less scales. Stipes numerous, densely tufted, brown- 
ish below, green above; leaves linear-lanceolate, 
2/-8’ long, 4’’-10’’ wide, once pinnate, pale green, 
soft, herbaceous or almost membranous; rachis 
green ; pinnae 12-20 pairs, ovate or rhomboid, deeply 
crenate, obtuse, unequal sided, their upper edges nar- 
rowed suddenly at the base, the lower obliquely trun- 
cate; sori oblong and numerous or scattered and fewer. 
On rocks, New Brunswick to British Columbia, south 
to the Green Mountains of Vermont. Also in northern 
Europe and Asia. Summer. 
7. Asplenium angustifolium Michx. Narrow-leaved Spleenwort. (Fig. 52.) 
Asplenium angustifolium Michx. Fl. Bor. Am. 2: 265. 
1803. 
Rootstock stout, creeping, rooting along its whole 
length. Stipes growing in a crown, brownish or 
green above, chaffless, 8’-12’ long, sometimes 
slightly scaly toward the base ; leaves lanceolate in 
outline, 1°-2° long, once pinnate, glabrous ; pinnae 
20-30 pairs, linear-lanceolate, or those of the sterile 
leaves lanceolate, acuminate at the apex, obtuse 
or truncate at the base, 2/-5’ long, flaccid, the mar- 
gins entire or slightly crenulate; fertile ieaves com- 
monly taller than the sterile, narrower, their pinnae 
generally much narrower, often falcate ; sori 20-30 
on each side of the midrib, linear, close together, 
the indusia at length concealed by the mature 
sporanges. 
In moist woods and shaded ravines, Quebec to Wis- 
consin, south to Virginia and Kentucky. Ascends to 
1700 ft. in the Adirondacks, to 2300 in the Catskills. Aug. 
