696 HEPATICE. (liverworts.) 



oblique, spreading, rotmded-obovate, entire or denticulate ; perianth terminal. — 

 Grows with No. 1. (Eu.) 



* # Amphigastria fugacious, 2-3-cleft. 



3. P. porciloides, Lindenberg. Stems divided; the branches ascend- 

 ing ; leaves rather imbricated, convex-gibbous, rounded-obovate, those at and near 

 the summit of tbe stem repand-denticulate, the others entire; perianth oblong, 

 the mouth denticulate. — Among Mosses, at the base of trees in swamps. 



4. P. microstoma, Sulliv. Stems prostrate, rooting copiously, 

 branched; branches not ascending; leaves nearly oval, horizontal, entire or 

 slightly repand ; perianth broadly obconic, the mouth compressed, margin re- 

 pand ; amphigastria lanceolate, 2-3-cleft. — Moist banks and decayed logs, 

 Ohio. (Tab. 22.) 



5. P. JLudoviciftna, Sulliv. Main branches ascending, flexuous, spar- 

 ingly ramulose; leaves patent-divergent, semi-ovate, 2- 3-dentate at the apex, 

 their ventral margins decurrent and forming two parallel crest-like lines on the 

 under side of the stem, the dorsal margins reflexed and entire, the ventral spinu- 

 lose-dentate ; amphigastria deeply 2-3-cleft, the segments ciliate-dentate. — 

 Bark of trees, Louisiana. 



6. P. anaata, Sulliv. Kesembles the last; but is more rigid, with sim- 

 ple branches ; leaves horizontal, triangular-ovate, obtuse, emarginate, or sparing- 

 ly dentate at the apex, the dorsal margins reflexed and entire, the ventral repand- 

 undulate and forming crest-like lines as in No. 4 ; amphigastria 2-cleft, the seg- 

 ments dentate. — Shaded rocky banks of the Savannah River, Georgia. 



27. SARCOSCYPHUS, Corda. (Tab. 21.) 



Fructification terminal. Involucral leaves united nearly to the top into an 

 oblong tube. Perianth 4-6-toothed, connate (except the teeth) with the inte- 

 rior surface of the involucral leaves. Calyptra membranaceous. Capsule glo- 

 bose. Elaters with two spiral fibres. Antheridia in the saccate base of perigo- 

 nial leaves. Stems erect, producing from their base runner-like rootlets. Stem- 

 leaves 2-lobed. Amphigastria none. (Name composed of <rdp£, flesh, and 

 VKixpos, a cup; from the fleshy tubular involucre.) 



1. S. Elirharti, Corda. Leaves erect-spreading, rather quadrate, em- 

 bracing the stem by the broad base; lobes obtuse. — On mountains. — Plant of 

 a firm texture, dark green or brownish-purple. (Tab. 21.) 



28. GY1NOMITBIU1, Corda. (Tab. 21.) 



Fructification terminal. Involucral leaves 2-4, convolute, emarginate. Peri- 

 anth none. Calyptra short. Capsule globose. Elaters with two spiral fibres. 

 Antheridia obovate, axillary. Stem-leaves 2-lobed. Amphigastria none. 

 (Name from yvfivos, naked, and pirpiov, a little cap ; the calyptra not covered by 

 a perianth.) 



1. O. COnclnnatnm, Corda. Stems erect, filiform, brittle, sparingly 

 branched ; branches thickened at the apex, obtuse ; leaves densely imbricated, 

 ovate, with a narrow membranaceous margin. — Alpine regions of the White 



