694 HEPATic.E. (LIVERWORTS.) 



8. J. l>arl>ata, Schreber. Stems procumbent, sparingly branched; leaves 

 roundish-quadrate, 3 - 5-lobed, the sinuses obtuse and undulate ; lobes obtuse, 

 acute, or mucronulate, variously directed ; amphigastria (when present) broad, 

 entire or 2-toothcd ; perianth angularly plaited to near the apex, the mouth den- 

 ticulate. Hilly districts, on the ground, rocks, &c. : variable. (Eu.) 



9. JT. Iflicliailxii, Weber. Stems ascending, flexuous by repeated inno- 

 vations from below the summit : leaves crowded, erect-spreading, rather saccate 

 at base and quadrate, 2-cleft, the sinus narrow ; the lobes acute, incurved ; ex- 

 terior involucral leaves large, serrulate, the inner smaller ; perianth oval, rather 

 club-shaped, the obtuse apex plaited, the month fringed. Alleghany Moun- 

 tains. (Eu.) 



10. J. iiiclsa, Schrader. Stems prostrate, thick, rather flat, rooting co- 

 piously ; leaves densely crowded, somewhat quadrate, waved, 2 - 6-cleft, the 

 segments unequal ; perianth oval or obovate, the mouth plaited, denticulate. 

 Damp, shaded places, on the ground. A small, pale green species. (Eu.) 



11. J. intermedia, Lindenberg. Stems prostrate, almost simple ; leaves 

 roundish-quadrate, 2-cleft ; the upper ones crowded into heads, and 3-4-cleft; 

 involucral leaves 3 - 4-cleft, slightly serrate, connate at the base ; perianth short, 

 ovate-triangular, the mouth plaited, denticulate. On the ground. A small 

 species. (Eu.) 



* * * Leaves nearly orbicular, undivided; amphigastria different or obsolete. 



12. J. SClltata, Weber. Stems procumbent ; leaves half vertical, emar- 

 ginate-2-toothed ; the teeth straight and acute ; involucral leaves 2 - 3-toothed ; 

 amphigastria large, ovate-triangular, 1 -2-toothed on the margin near the base ; 

 perianth obovate, the mouth plaited, denticulate. Old logs, &c. A minute 

 species. (Eu.) 



13. J. Scliraderi, Martins. Stems creeping, flexuous ; leaves elliptical- 

 orbicular, ascending ; outer involucral leaves large, elongated, entire or emargi. 

 nate, spreading at the apex; the inner smaller, more or less laciniated; amphi- 

 gastria obsolete ; perianth oval-obovate ; the mouth piaited-lobed, its lobes 

 ciliate. (J. orbicularis, Michx.f) Decayed logs, &c. ; common. Foliage 

 often dark purple. (Eu.) 



14. J. faylori, Hook. Stems erect, nearly simple; leaves orbicular, 

 with large areolae ; amphigastria broadly subulate ; perianth oval, compressed 

 at the mouth, truncate and 2-lobed. Bogs; mountains of Xew England. A 

 large species, with purple foliage. (Eu.) 



15. J. crenillata, Smith. Stems prostrate, branched ; leaves orbicular, 

 ascending, those toward.; the perianth larger and bordered by large marginal 

 cells ; perianth obovate, compressed-4-angled, the mouth much contracted, 

 toothed. Margins of ditches, Mobile, Alabama. (Eu.) 



* * * * Leaves unequally complicate-2-lobed (i. c. folded together) : the involucral 

 ones 3 - 5-cleft : perianth oblong, obtuse, plaited. 



16. J. CXSeCta, Schmidel. Stems ascending; dorsal lobe of the leaves 

 small, acute; ventral lobe concave, acute or 2-toothed. Boggy places, decayed 

 wood, &c. (Eu.) 



