FILICES. (FERNS.) 597 
hidden by the ripened sporangia. — Rocky places, North Carolina, Tennessee, 
and northward. — Fronds 6' - 16' high. 
17. DICKSONIA, L'He. $ SITOLOBIUM, Desv. | 
Fruit-dots small, globular, terminal on the free veins; sporangia on an ele- 
vated receptacle in a thin cup-shaped involuere which is partly adherent to a 
reflexed lobule of the frond. Fronds large, 2 —3-pinnate, from a creeping root- 
stock. — Dickson1A proper has large two-lipped involucres, of a firmer texture, 
and several species have an arborescent caudex. 
1. D. punotilobula, Kunze. Fronds delicate, slightly glandular-pubes- 
cent, as is the rachis, lanceolate-acuminate, 2 —3-pinnate ; pinnz numerous; 
pinnules oblong-ovate, closely placed, obtuse, pinnately incised. or. pinnatifid ; 
the divisions obtusely serrate, each one bearing a minute fruit-dot at the upper 
margin. — Moist shady woods in the upper part of North Carolina, Tennessee, 
and northward. — Rootstock slender, extensively creeping. Fronds 2°-3° high, 
when crushed returning a pleasant odor. 
18. TRICHOMANES, L. 
Bporangia. wid a brina ol RD cmi iin: do lower. part of. a 
cylindrical, filiform, often elongated receptacle: involucres marginal, funnel- 
shaped, or bell-shaped, entire or two-lipped at the mouth. Fronds delicate, very 
thin and pellucid. 
1. T. Petersii, Gray. Very small, with entangled filiform tomentose root- 
stocks ; fronds oblong-lanceolate or obovate, entire or variously pinnatifid, nar- 
rowed into a slender stipe nearly as long as the frond, the younger ones with a 
few black forked hairs along the margin; veins forked, pinnate from the midrib ; 
involucre solitary, terminal, funnel-shaped, the mouth expanded and slightly 
two-lipped, receptacle included.— On the face of a sandstone rock, sprinkled 
from a waterfall, Hancock Co., Alabama, 7. M. Peters. Also among some 
Mosses sent from Pensacola, Florida. — Fronds less than an inch high. 
9. T. radicans, Swartz? Fronds pellucid, with a loose roundish areola- 
tion, on a short broadly winged stipe, lanceolate or ovate-lanceolate, bipinnatifid ; 
pinne ovate or deltoid-ovate, obtuse, the upper side of the base parallel and 
appressed to the winged rachis, the lower side cuneate; divisions toothed or 
divided into linear lobes; involucres terminal on short lobes of the pinne, 
tubular-funnel-shaped, margined, at the mouth truncate and slightly two-lipped ; 
receptacle exserted a little or very much. (T. Boschianum, Sturm.) — Hancock 
County, Alabama, Peters, Beaumont. Cumberland Mountains, Eastern Tennes- 
see, Rev. Dr. Curtis. — Rootstock slender, creeping, tomentose with black hairs. 
: s 8! high, 12"- -18" wide. 
" 
gia beneath orate asd dgel i imbrionted inis in a doublo row on 
