FILICES. (FERNS.) 
631 
with the shorter lobes few-toothed at the apex; fruit-dots sparse; in¬ 
dusium fringed with stalked glands at its margin. (Aspidium inter¬ 
medium, Muhl. in fVilld. /) —The commonest species of this country, 
on hill-sides in woods, the Asp. dilatatum of American authors gener¬ 
ally, but not that of Swartz and Willdenow. 
4. D. dilatata. Frond ovate or triangular-ovate in outline (1°- 
2 4° long); pinnules triangular-lanceolate, or lance-oblong , mostly acute , 
directed obliquely furicards , often rather scythe-shaped, all the lower 
pinnatifid into closely set oblong lobes, cut-toothed, the appressed 
teeth spiny-pointed; fruit-dots just within the sinuses; indusium 
smooth. (Asp. dilatatum, Willd. Lastra?a, Presl.) —Cold woods, 
northward, rare. — Frond broader, usually larger, and with coarser di¬ 
visions, than in the last, also distinguished from it, as well as from D. 
spinulosa, by its smooth and entire indusium. 
* * Fronds at most 2-pinnate , the pinnules barely incised or toothed: in¬ 
dusium thickish , at first tumid , persistent: rachis chaffy when young. 
5. I>. rigida. Frond oblong-lanceolate in outline, short-stalk¬ 
ed ; pinnae lanceolate from a broad base or the lower triangular-lan¬ 
ceolate, pointed, numerous and approximated, mostly opposite ; pin¬ 
nules many pairs , broadly oblong , obtuse, nearly horizontal, confluent 
on the narrowly-winged rachis, sharply serrate with pointed teeth , the 
lower ones cut-lobed or pinnatifid-toothed ; fruit-dots small for this sec¬ 
tion (larger than in the last), halfway between the midrib and the mar¬ 
gins ; indusium minutely glandular. (Asp. rigidum, Sicartz.) —The 
only specimen I have seen is that kindly lent by Mr. luckerman, 
gathered in woods near Lowell, Massachusetts, by Mr. Wm. Boott, 
and which Mr. T. has described as Jispidium Boottii: but it seems to 
differ from A. rigidum only in its luxuriant size (52? long), and the up¬ 
per surface of the indusium is sprinkled with minute deciduous glands. 
It is deep green in color, and, although allied to D. spinulosa, yet with 
the thicker fronds and the fruit-dots of the present subdivision. 
6. I>. crist&ta. FYond linear-oblong in outline (1£° to 
long and very long-stalked); pinnae short, triangular-oblong, or the 
lowest nearly triangular-ovate, from a somewhat heart-shaped base, 
acute, commonly alternate, deeply pinnatifid; pinnules (8- 13 pairs) 
oblang , very obtuse, finely seriate or cut-toothed, the lowest pinnati- 
fid-lobed ; fruit-dots as near the midrib as the margin , large , often con¬ 
fluent ; indusium smooth and naked. (Asp. cristatum and A. Lancas- 
triense, Swartz.) — Swamps, &c., common. July. Rather variable: 
stalk with broad deciduous chaffy scales: pinnae 2' -ty* long. 
7. I>. Coldiana. Frond broadly ovate , or the fertile ovate-ob¬ 
long in outline (2P-3? long), short-stalked; pinna: oblong-lanceolate, 
mostly alternate, pinnately parted; pinnules {about 20 pairs ) narrow¬ 
ly oblong , slightly scythe-shaped, obtuse (1 ; long), serrate wit ap 
pressed teeth, bearing the distinct fruit-dots nearer t te mi ri ian te 
