7-00 HEPATIC^E. (LIVERWORTS.) 



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

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

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

 gastria large, decurrent. (Name formed of /ia8os, bald, and <%?;, capsule; the 

 elaters falling away from the valves.) 



1. HI. platypliylla, Dumort. Stems irregularly 2-pinuate 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. 22.) (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- 

 tase ; 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. OT. WatailgensiS, (n. sp.) Much like No. 2, but a smaller and 

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

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

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

 banks of the Watauga River, North Carolina. (M. porella, var. ? Muse. 

 Alleghan. No. 265.) 



32. RADII I, A, Nees. (Tab. 22.) 



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 monoecious. Antheridia in the ventricose base of minute perigonial 

 leaves. Stem-leaves 2-lobed, the small inflexed ventral lobe producing rootlets, 

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

 flaccid plants.) 



1. R. COHlplanata, Dumortier. Stems flat, irregularly and somewhat 

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

 tral much smaller, triangular-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. obcdllica, Sulliv. Stems indeterminately branched ; leaves dis- 

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

 the mouth obliquely truncate and entire. (R. complanata, var. ? Muse. Alleghan. 

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

 marked by the shape of its perianth. (Tab. 22.) 



3. R. palleilS, 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. 



