700 (100) HEPATIC^, (liverworts.) 



tenuated at both ends, with two spiral fibres. Spores large, rather angular. 

 Inflorescence dioecious. Antheridia in the saccate base of closely imbricated 2- 

 lobed perigonial leaves. Stem-leaves deeply and unequally 2-lobed. Amphi- 

 gastria large, decurrent. (Name formed of fiabos, bald, and 6r]KT], capsule; the 

 elaters falling away from the valves.) 



1. M. platypbylla, Dumort. Stems irregularly 2-pinnate or nearly so ; 

 dorsal lobe of the leaf roundish-ovate, the basal margin more or less undulate ; 

 the ventral lobe smaller, oblique, heart-oval, margins reflexed ; amphigastria 

 round-obovate with reflexed margins ; mouth of perianth nearly entire. — Trees 

 and rocks, common; a large and variable species. (Tab. VIII.) (Eu.) 



2. M. porella, Nees. Stems 2-3-pinnate (2' -4' long), the forked 

 branches divergent ; leaves distantly placed ; the dorsal lobe oblong-ovate, ob- 

 tuse ; the ventral much smaller, appressed to the stem, oblong, flat ; amphi- 

 gastria quadrate ; mouth of the perianth crenulate. — Stones and roots of trees 

 subject to inundation. (Eu.) 



3. ai. 'Watang:en$is, (n. sp.) Much like No. 2, but a smaller and 

 more dehcate species, with fascicles of rootlets springing from the base of the 

 amphigastria, and the dorsal lobe of the leaf shghtly repand-dentate ; foliage 

 light yellowish-brown : no fruit seen. — Closely adhering to decayed logs ; 

 banks of the Watauga Eiver, North Carolina. (M. poreUa, var. ? Muse. 

 AUeghan. No. 265.) 



32. RADUIiA, Nees. (Tab. Vm.) 



Fructification terminal on short branches, or in a fork. Involucral leaves 2, 

 deeply 2-lobed. Perianth compressed or nearly terete ; the mouth dilated. Ca- 

 lyptra pear-shaped, persistent, opening below the apex. Capsule oval. Elaters 

 attenuated at both ends, with two spiral fibres. Spores 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. 

 Amphigastria none. (Name from paBdkos, pliant, because these are mostly 

 flaccid plants.) 



1. B. complanata; Dumortier. Stems flat, irregularly and somewhat 

 pinnately branched, flaccid ; leaves imbricated ; dorsal lobe roundish ; the ven- 

 tral much smaller, triangtdai'-ovate, appressed ; perianth oblong, compressed, 

 the mouth truncate and entire. — A large pale-green species; growing in orbic- 

 ular patches on the bark of trees, &c. (Eu.) 



2. R. obconica, SuUiv. Stems indeterminately branched; leaves dis- 

 tantly placed ; dorsal lobe obovate-roundish, convex ; perianth clavate-obconic, 

 the mouth obliquely truncate and entire. (R. complanata, var. 1 Muse. AUeghan. 

 No. 260.) — Trees, Cedar swamps, Ohio. — Much smaller than the last; weU 

 marked by the shape of its perianth. (Tab. "Vlil.) 



3. B. pallens, Nees. Stems rigid, divaricately fork-branched; leaves 

 imbricated ; dorsal lobe roundish, decurrent, the ventral lobe with an inflexed 

 apex ; perianth elongated funnel-form, the mouth entire. — Old logs, &c., Alle- 

 ghany Mountains. 



