632 
FILICES. (FERNS.) 
margin (smaller in proportion than in No. 6). (Asp. Goldi&num, 
Hook ) — Rich, moist woods, from Vermont and New York westward. 
Sept. — A showy Fern : fertile fronds commonly decaying in autumn. 
8. I>. marginale. Frond 2-pinnate, ovate-oblong in outline 
(1° - 2? long) ; pinnae opposite, lanceolate from a broad almost sessile 
base; pinnules oblong, obtuse (£' to §' long), crowded, obtusely ere* 
nate-toothed, at least the lower, the upper confluent, bearing the con¬ 
spicuous distinct fruit-dots next the margin; indusium smooth. (Asp. 
marginale, Sioartz.) — Rocky hill-sides and ravines in moist woods, 
very common. July. 
15. POLYSTICHUM, Roth, Schott. Shield-Fern. 
Fruit-dots round, borne on the back of free pinnately-forked 
veins (especially on the lower outer one of each set). Indusium 
orbicular, shield-like, fixed by the depressed centre, opening all 
round the margin. — Pinnate or 2-3-pinnate Ferns, much like 
§ Lastrsea of the last genus ; but rigid and coriaceous, evergreen, 
very chaffy ; the pinnae or pinnules auricled at the base on the up¬ 
per side, crowded, the teeth or lobes tipped with a spiny bristle. 
(Name composed of 7 roXvy, many , and o-ri^os*, a row or line, the 
numerous fruit-dots forming close lines in the original species.) 
* Fronds twice pinnate , spreading. 
I■ !*• aculcatnm, Roth. Frond broadly lanceolate in out¬ 
line ; pinnae many pairs, lanceolate; pinnules ovate and slightly cres¬ 
centic or oblique, short-stalked or the upper confluent, obliquely trun¬ 
cate at the base, sharply toothed, chaffy-bristly, the one next the main 
rachis rather larger; truit-dots copious. — Deep woods, mountains of 
New Hampshire, Tuckerman , to those of N. New York, Macrae. 
Green Mountains, Vermont, Pursh , Macrae , fyc. — The plants I pos¬ 
sess have obtuse pinnules, the lowest scarcely longer, as in the var. 
angulare : but I have the typical form from Halifax. 
* * Fronds simply pinnate , mostly upright. 
2. P. acrostic Isoldes, Schott. Frond lanceolate (l 0 - 2 ® 
stalked; pinnee linear-lanceolate , somewhat scythe-shaped, half* 
halbert-shaped at the slightly-stalked base, serrulate with appressed 
bristly teeth ; the fertile (upper) ones contracted and smaller , bearing 
contiguous fruit-dots near the midrib, which are confluent with age 
and cover the surface. (Nephrodium acrost., Michx. Aspidium, 
Swartz.) Var. incisum (A. Schweinitzii, Beck) is a slate with cut- 
lobed pinnae, a not unfrequent case in the sterile fronds. — Hill-sides 
and ravines in woods, common. July. 
3. P. Loiichitis, Roth. Frond linear-lanceolate (9'-20'high), 
scarcely stalked , very rigid ; pinnee broadly lanceolate-scythe-shaped , or 
