422 CLASS XXIV. ORDER I. 



AsPLENiCM EBENEUM. Ait. Ebony Spleenwort. 



Frond pinnate ; divisions lanceolate, somewhat fal- 

 cate, serrate, anricled at base; stem quite smooth. 

 Syn. AsPLENiUM trichomanoides. Mich. 



Considerably larger than the last. Stipe slender, of a smooth, 

 polished, jet black. Divisions or leafets sessile, oblong, tapering 

 to a point, sometimes a little curved, somewhat serrate, furnished 

 with an acute lobe on each side at base, which gives them a sort 

 of hastate form. Fructification in short, diverging lines, arranged 

 in a double row on the back of the divisions. — Dry woods and 

 hills. — Perennial. 

 AsPLENiUM THELYPTERoiDEs. Midi. Silvcvi/ Splecnwort. 



Frond pinnate; divisions pinnatiiid : segments oval, 

 round-obtuse, slightly denticulate;- fructification in 

 short, eq\ial, oblique, parallel lines. Mich. ahr. 



This most beautiful fern grows to a pretty large size. Stipe 

 smooth, pale. The divisions of the frond are long and pinnatifid. 

 Segments oblong, close, even, parallel, rounded at the end and 

 nearly entire. Fructification in two rows of short, oblique, close 

 parallel lines, the opposite pairs forming nearly a right angle. 

 The involucres, when young, have a bright, silvery appearance. 

 — Found by a brook in Roxbury. — Perennial. 



AsPLENiuM RUTA MURARiA. L,. Dwarf SpUenwort. 



Fronds twice pinnate at base, simply pinnate at 

 top; segments rhomboid-wedge shaped, obtusely den- 

 ticulate. 



A very small spreading fern found on dry rocks and hills in 

 the western parts of the slate. 



AsPLENiuM ANcusTiFOLiuM. WHlcl. Stoamp Splcenwort. 



Fronds pinnale, the divisions ahernate, upper ones 

 opposite, linear-lanceolate, somewhat rrpand, their 

 base truncated on the upper, and rounded on the 

 lower side. 



