688 
HEPATIC-®. (LIVERWORTS.) 
shaped, persistent, with a style, opening below the apex. Capsule 
pedicelled, oval, 4-parted ; the valves erect-spreading, within nod- 
ulosely striate. Elaters attenuated at both ends, with two spiral 
fibres. Spores large, globose. Inflorescence monoecious. An- 
theridia in the ventricose base of minute perigonial leaves. Stem- 
leaves 2-ranked, incubous, 2-lobed, the small indexed ventral lobe 
producing rootlets. Amphigastria none. (Name from paSaAos, 
pliant , for these flaccid plants.) 
1. R. complanata, Dumortier. Stems flat, irregularly and 
somewhat pinnately branched, flaccid ; leaves imbricated ; dorsal lobe 
roundish ; the ventral much smaller, triangular-ovate, appressed , 
j perianth oblong , compressed, the mouth truncate and entire. — A large, 
pale-green species, growing in orbicular patches on the bark of trees, &c. 
2. R. ohcoilica, (n. sp) Stems indeterminately branched; 
leaves distantly placed ; dorsal lobe obovate-roundish, convex j per¬ 
ianth clavate-obconic. , the mouth obliquely truncate and entire. (R- 
complanXta, var. ? Muse . Mleghan. No. 260.) — Trees, Cedar swamps, 
Ohio. — Much smaller than the last, well marked by the shape of its 
perianth. 
3. R. p;illcilS, Nees. Stems rigid, divaricately fork-branched , 
leaves imbricated ; dorsal lobe roundish, decurrent, the ventral with an 
inflexed apex; perianth elongated funnel-form , the mouth entire. 
Old logs, &c., Alleghany Mountains. 
16. PTIL.IRIUUI, Nees. Fringed Scale-Moss. 
Fructification terminal on short branches. Involucral leaves 
2-4, four-cleft. Perianth terete, obovate ; the mouth connivent, 
plaited, denticulate. Pistillidia numerous. Calyptra pear-shaped, 
coriaceous, style-bearing. Capsule pedicelled, ovate, 4-valved to 
the base. Elaters with two spiral fibres. Inflorescence dioecious. 
Antheridia covered by closely imbricated perigonial leaves. Stem 
leaves 2-ranked, incubous, complicate -2-lobed, each lobe divided. 
Amphigastria 4-5-lobed. (Name a diminutive of irrihov, a 
downy feather; from the cut-fringed foliage.) 
1. P. Ciliare, Nees. Stems crowded, rather pinnate; lea\es 
4-clefl; and amphigastria both lacerately ciliate, the fringe long an 
setaceous. — Rotten logs, in woods. 
17. TRICIIOCOL.EA, Nees. Downy Scale-Moss. 
Fructification situated in a fork. Involucral leaves numerous, 
coalescent into an oblong and truncate coriaceous hairy tube. 
