420 CLASS XXIV. ORDER I. 



visions of the frond nearly pinnate. Subdivisions or segments 

 distinct, oblong, obtuse, crenate, contracted at base, afterward 

 decurrent, so that their common stalk becomes slightly winged, 

 or the division pinnatifid. Dots of fructification distinct, round, 

 close to the margin. Their umbilicated involucre is very obvi- 

 ous. — Woods, Roxbury. — Perennial. 



AsPiDiuM AsPLENioiDEs. Muhl. Dark Shield Fern, 



Stipe glabrous ; frond twice pinnate; segments ob- 

 long, cut, toothed ; dots reniform, arranged near the 

 nerve. 



This is a large, smooth, brittle fern. Divisions of the frond 

 pinnate ; the segments oblong, acute, with distinct teeth, sepa- 

 rated by deep indentations. The teeth are again denticulate, and 

 the lower ones somewhat obtuse. Fructification with reniform 

 or lunulate involucres, at first resembling lines, as in Asplenium, 

 afterwards extending over the whole under surface of the frond, 

 giving it a brownish appearance. — Moist woods. 



AsPiDiUM BULBiFEUUM. L. Bvlhiferous Fern. 



Frond twice pinnate, oblong-lanceolate, segments 

 opposite, oblong, obtuse, serrate, the lower ones pin- 

 natifid, midrib bulbiferous. 



A delicate, thin leaved fern, with small roundish fructification, 

 and stem bulbs attached to the midrib in the upper parts of the 

 plant. — Norwich, Connecticut, Mr. Eddy. 



428. ONOCLEA. 

 Onoclea sensibilis. L. Sensitive Fern. 



Barren fronds pinnate; segments cut, the upper 

 ones united; fertile fronds doubly pinnate, with re- 

 curved, globular subdivisions. 



A great difference, in appearance, exists between the barren 

 and fertile fronds of this plant. The barren frond is composed 

 of large, broad, oblong, sinuaied leaves or divisions, the lower 

 ones distinct, the upper ones connected by their base. The fer- 

 tile frond is much narrower, its divisions short, its segments 



