6 
Illustrated in Anne Pratt’s “ Ferns and Flowering Plants of 
Great Britain.” 
96. A. viride Huds. Green Spleenwort. Stipes tufted, 
chestnut brown ; fronds 4-10 inches long, simply pinnate; pinnm 
ovate or rhomboidal, crenately toothed, Evergreen. Shaded cliffs 
in Northern Yt. ; Sterling Mt , Mt. Mansfield, Smuggler’s Notch, 
and extending across our northern border "to the Pacific. Pare. 
Middle of September. Europe and Himalaya mountains. 
V 
99. A. angustifolium Michx. Narrow-leaved Spleenwort. 
Fronds 1-3 feet long ; laminae simply pinnate, very thin ; pinnae 
lance-iinear and acuminate, those of the fertile fronds narrower ; 
sori 20-40 each side of the midvein ; stipes green Damp ground ; 
not common and nearly confined to that section of country west of 
the Connecticut river. Mt. Toby, Leverett, Mass. ; Berlin and 
Meriden, Conn. ; Danville, Yt. September. North American 
This fern is usually sterile when in complete shade, but will 
fruit if transplanted into more sunny situations. 
101. A. ruta=muraria L. Wall Rue. Yery small, 1-2| in , 
bipinnate below, simply pinnate above ; divisions few, petiolate, 
cuneate to obvate, toothed at apex ; sori few, soon confluent. Ever, 
green. Calcareous rocks. Mt. Toby, Mass. ; Southington, Berlin, 
Canaan, Conn. ; Mt. Willoughby, Mt. Mansfield, and Snake moun- 
tain, Vt Scarce. August. Northern Europe and Asia. 
102. A. montanum Willd. Mountain Spleenwort. Small, 
2-8 inches ; bipinnate ; divisions parted into 3-7 two or three-tootli- 
ed segments. East Haddam and Lantern Hill, N. Stonington, Ct. 
Very rare in our region. Peculiar to the United States. Cliffs and 
rocks. Evergreen. Middle of August. 
This fern appears to be in fair condition at all seasons. 
107. A. acrostichoides Swz, ( A . thelypter aides Michx ) Sil- 
very Spleenwort. Tall, 1-2 feet ; laminae pinnate ; pinnae deeply 
pinnatifid ; segments crowded, those of sterile fronds very obtuse ; 
two rows of distinct linear sori ; rachis winged. Rich woods and 
