?
2. K . B c y r i c l i i a n a , Hampe. Erond oblong-linear, thickened and bifid
at tho apex, naiTowly channelled above, dark purple beneath; the margins
entire, ascending. — Tennessee.
3. R . b i f f u i 'C a , Hoffm. Erond suborbicuiar, pale-green; its divisions
wedge-shaped, 2-lobed at tho apex; lobes spreading, dotted, broadly channelled
above, purplish beneath, the thickened margins ascending. — “ North America.”
[G. L . ^ N . Syn. HepaLp. (jQQ.) (Eu.)
* * Frond with large air-cavities: ten’estrial or aquatic.
4. R . i i a t a n S y E. Erond inversely heart-shaped, channelled above (3" -
5" broad), clothed beneath with long pendent rootlets in the form of linear-lanceolate,
serrate, purple fringes; capsules in two rows, lengthwise of the frond.
— Eloating on the surface of stagnant water. (Tab. VI.) (En.)
5. R . I l u i t a n s , L. Erond radiately expanding (1' or more in diameter);
divisions naiTowly linear, repeatedly forking, nearly membranaceous; at the
apex thickened, emarginate and cavernous; capsule protuberant from tho lower
surface of the frond. — Eloating on stagnant water. (Eu.)
6. R , lu teS C C llS , Schwein. Erond light-green, orbicular, in diameter;
the divisions 6 - 8 , linear, 2 - 3 times forking, channelled above, obcor-
date at the extremity, thickened, with whitish obliquely-ovate and appressed
scales beneath. — On the ground, margins of ponds, &c. — Eruit unknown.—
[Sulliv. in Mem. Amer. Acad. n. ser. 4, p. 176, t. 4.)
7. R . c r y s t a lU i i a , L. Erond orbicular, 4 " - 6 " in diameter; its divisions
obcordate or linear-bifid, the margins subcrenate, the surface broken up
by deep pits, communicating with the air-cavities. — Damp ground.—Eruits
abundantly. (R. vclutina, Hooh. Ic. PI. t. 149, is founded on sterile fronds of
No. 6, and fertile fronds of No. 7.) (Eu.)
R o u 3 . S P H jE R O C I r P U S , Mich. n d -h e a d e d E iv e r w o e t .
(Tab. VI.)
Involucre sessile upon and continuous with the frond, obtusely conical or
pyriform, perforated at the apex, 1-fruited, Capsule globose, closely invested
by the calyptra. Spores round, muriculate. (Antheridia in folliculose bodies
on the surface of separate fronds. Wilson.) (Name composed of crcpaipos, «
sphei-e, and Kapnos, fruit.)
1. S . M i c l l c U i , Bellardi. Frond orbicular, 3 " - 6 " in diameter, lobed,
entirely concealed by the numerous aggregated inflated involucres, which arc
about I " long, and 4 - 5 times larger than the capsules. (S. terrestris o f authors.)
— Cultivated fields. South Carolina, Curtis, liaBeaeZ. (Tab. VI.) (Eu.)
A N T H O C E R O T E u E .
Te rre strial, frondose annuals, with th e fru it pro tru d ed from th e up p er
surface o f th e frond. P e rian th none. Capsule pod-liko, mostly 1 - 2 -
valved. Columella filiform. Elaters none or imperfect.
3. A N T I I Ô C E R O S , Mich. I I o e n e d L i v e e w o e t . (Tab. VI.)
Involucre tabular. Calyptra conical, with a subsessile stigma. Capsule
narrowly linear, siliquæform, 2-valvcd, exsertly pedicelled. Spores muriculate.
Elaters flexuous, tbe spiral fibres imperfect or none. Inflorescence monoecious ;
antheridia dorsal, sessile in a cup-shapod involucre. — Frond orbicular-radiate,
lacerate, with immersed gemmæ as in Notothylas. (Name formed of avSos,
a blossom, and uépas, a horn ; from the shape of the involucre.)
1. A . p im c t à tU S , L. Frond deep green, 5 " -8 " in diameter, margins
plicate, crenate, the surface papuloso-rcticulated ; involucre erect, cylindrical,
with a scarious and obliquely tmncato mouth. — Wet slopes, sides o f ditches,
&c. (Eu.)
2. A . l æ v i s , L. la rg e r than the preceding species ; surface of froud
smooth ; mouth of the involucre more broadly scarious. — In similar places.
(Tab. VI.) (Eu.)
3. A . l a c i l î i s i tU S , Schwein. A still larger species ; the frond more la-
ciniated, its surface smooth : distingnished from No. 1 and 2 mainly by tho
bilobed mouth of its involucre. — Wot gravelly places. Southern States : forming
patches a foot or more in diameter.
4 . N O T O T I I À E A S , Sulliv. (Tab. VI.)
Involucre a protnsion o f a portion of the upper stratum of the froud, opening
irregularly at tho apex. Calyptra vanishing early. Capsule closely invested
by tho involucre, oblong-ollipsoidal, subcompressed or ovate-cylindrical, slightly
pedicelled, either 2-valved from the apex half-way down, or rupturing irregularly.
Columella linear. Elaters wanting. Spores roundish, smooth. Inflorescence
monoecious : anüicridia iipmersed in the frond. — Erond orbicular,
laciniate, papulose-reticulated, undulate-crispcd at the margin, and with dark
green oval grains (gemmæ) scattered witliin its substance. (Mem. Amer.
Acad. n. ser. 8, p. 64, t. 4. (Name formed of v&tos, the bade, and ôvXâs,
a purse or bag; from the shape of the involucre and its position on the back of
the frond.)
1. N . - v a lV i l t a , Sulliv. Frond 3 " - 8 " wide; involucre horizontal-elongated,
tapering-dcflexed ; capsule ovate-cylindrical, horizontal-incurved, 2-valvcd
by a dark-colored suture ; spores light yeUowish-brown. (Muse. Allcghan. No.
2 8 9 .)— Moist ground. Central Ohio. (Tab. VI.)
2. N . I i i e l a i i o s p o r a , Snlliv. Capsule often without any suture ; columella
with short hooked appendages ; spores dark brown, larger than in the
preceding, which in other respects it resembles. - - Grows in similar localities.
(Muse. AUeghan. No. 290.)
3. W. o r k i c i l l à r i s , Schwein., SuUiv. Involucre nearly erect; capsule
ohlong-dlipsoidal, subcomprcsscd, the suture evident or obscure : somewliat
smaller than the others. — On tho ground. North Carolina, Sdiioeinitz: Penn-
sylvania, Lesquereux.