490 HEPATICH. (LIVERWORTS.) 
apa at both ends, with two spiral fibres. Spores large, rather angular. 
Inflorescence dicecious, Antheridia in the saceate base of closely imbricated 2- 
lobed Srtecnta leaves, Stem-leaves deeply and unequally 2-lobed. Amphi- 
gastria large, decurrent. (Name formed of padds, bald, and @yxn, eapsule; the 
geice: falling away from the valves.} 
1. M. platyphylla, Dumort. Stems irregularly 2-pinnate or nearly so 5 
dorsal lobe of the leaf roundish-ovate, the basal margin more er less undulate ; 
the ventral lobe smaller, oblique, heart-oval, margins reflexed ; amphigastria 
round-obovate with reflexed margins; mouth of perianth nearly entire. — Trees 
and s, common; a large and variable species. gst 22.) (Eu.) 
2, Mi. poréla, Nees. Stems 2-3-pinnate (2/-4/ long), the forked 
branches divergent; leaves Setinity lei. ae ae al lobe oblong-ovate, ob- 
e; the much smaller, appressed to the stem, oblong, flat ; amphi- 
gastria quadrate ; mouth of the perianth erenulate.— Stones and roots of trees 
subject to inundation. (Eu.) 
augénsis, (n. sp.) Much like No. 2, but a smaller and 
more en ee with faseicles of rootlets springing from the base of the 
amphigastria, and the hese lobe of the leaf slightly pelea foliage 
light perso o fruit seen.— Closely adhe o dec ogs; 
banks of the Wa sini pies North Carolina. (M. ata, var. ? Muse. 
pre No. 265.) 
32. RADULA, Nees. (Tab. 22. 
Fructification ternzinal on short branches, or in a fork. Tnvolucral leaves 2, 
lyptra pear-shaped, persistent, opening below the apex. Capsule oval. Elaters 
attenuated at both ends, with two spiral fibres. = large, globose. Inflo- 
rescence moncecious. Antheridia in the ventricose base of minute perigonial 
leaves. Stem-leaves 2-lobed, the small inflexed ventral lobe producing rootlets. 
mphigastria none. (Name from padados, pliant, because these are mostly 
ts.) 
1. B. complanata, Dumortier. epee - eer larly and somewhat 
pinnately branched, flaccid ; leaves imbricated ; lobe roundish; the ven- 
tral much smaller, triangular-ovate, a AcE pond oblong, compressed, 
the mouth truncate and entire. — A large species ; growing in orbic- 
ular patches on the bark of trees, &e. (Eu. 
2. KR. obcénica, Sulliv. Stems indeterminately branched; leaves dis- 
tantly placed; dorsal lobe obovate-roundish, convex ; perianth clavate-obconic, 
the mouth obliquely truncate and entire. (R. obit: var.? Muse. Alleghan. 
No. 260.) — Trees, Cedar swamps, Ohio. .— Much smaller than the last; well 
marked by the shape of its sihaet (Tab. 22.) 
3. B. pallens, Nees. Stems rigid, divaricately fork-branched ; leaves 
mbricated ; dorsal lobe roundish, decurrent, the ventral lobe with an inflexed 
apex 5 perianth elongated funnel-form, the mouth entire. — Old logs, &c., Alle- 
ghany Mountains, 
