694 IIErATIC^E. (liverworts.) 



8. 3. Itarbata, 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-toothed ; perianth angularly plaited to near the apex, the mouth den- 

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



9. 3. RlaciBailxii, 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 mouth fringed. — Alleghany Moun- 

 tains. (Eu.) 



10. 3. incisa, Sehrader. 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. JT. iBiterjueslfa, Lindcnberg. 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". SCMtata, 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. JT. Sclsraderi, Martius. 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 plaited-lobed, its lobes 

 ciliate. (J. orbicularis, Michx. ?) — Decayed logs, &c. ; common. — Eoliage 

 often dark purple. (Eu.) 



14. 3. "Taylori, Hook. Stems erect, nearly simple; leaves orbicular, 

 with large areola? ; amphigastria broadly subulate ; perianth oval, compressed 

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

 large species, with purple foliage. (Eu.) 



15. JT. creaaBata, Smith. Stems prostrate, branched ; leaves orbicular, 

 ascending, those towards 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. 3. exsecta, Schmidcl. Steins ascending; dorsal lobe of the leaves 

 6mall, acute ; ventral lobe concave, acute or 2-toothed. — Boggy places, decayed 

 wood, &c. (Eu.) 



