712 JUNGERMANNIACE.E. (SCALE-MOSSES.) 



4. C. bicuspidata, Dumort. Prostrate or assurgent, cespitose, usually 

 greenish or reddish, with runners ; lower leaves small and distant, the upper 

 larger, round-ovate, cleft nearly to the middle, the lobes ovate-lanceolate and 

 acute, the lower lobe narrower and acuminate ; cells large, pellucid ; monoe- 

 cious ; involucral leaves about 3 pairs, the innermost nearly three times as 

 long as the outer, cleft - their length ; perianth four times as long as the leaves, 

 linear-prismatic or fusiform, thin, denticulate or ciliate; capsule cylindric- 

 oblong; spores purple. (Jungermannia bicuspidata, L.) On the ground, 

 mountains of N. Eng., N. Y., and N. J. (Eu.) 



5. C. curvifblia, Dumort. Slender, rarely forked, without runners, 

 greenish, reddish, or often purple ; leaves imbricate, ascending, obovate, con- 

 cave, semicordate at base, Innately bifid below the middle, the lobes incurved 

 or hooked ; cells small, quadrate ; monoecious or dioecious ; involucral leaves 

 complicate, the lobes subovate, spinulose-denticulate ; perianth large, rose- 

 purple, triquetrous, the wide mouth ciliate ; calyptra thin ; capsule oblong- 

 globose. (Jungermannia curvifolia, Dicks.) On rotten logs in swamps, etc. ; 

 common. (Eu.) 



* * Underleaves usually present; leaves rarely subimbricate. 



6. C. fluitans, Spruce. Stems 2-3' long, loosely creeping, with short 

 thick runners ; leaves large, ovate-oblong, lobed to near the middle, the lower 

 lobe larger, lanceolate, obtuse; cells large, mostly hexagonal; underleaves 

 linear, appressed ; dioecious ; involucral leaves cleft to the middle ; perianth 

 oval-cylindric, nearly entire ; calyptra short, pyrif orm ; capsule oblong ; spores 

 small, minutely tuberculate; antheridia globose, pedicelled, solitary in the 

 axils. In bogs, on mosses or partly floating; rare. (Eu.) 



2. CEPHALOZI&LLA. Perianth 3-Q-angled; leaf-cells small (14-20/i 

 broad) ; plants small t often minute ; underleaves present in n. 9. 



7. C. divaricata, Dumort. Sparingly branched, without runners; 

 leaves very small, cuneate or round-quadrate, the ovate-triangular lobes acute ; 

 cells pellucid or subopaque ; involucral leaves larger, the lobes acute, denticu- 

 late ; perianth linear or narrowly fusiform, prismatic, denticulate or subentire ; 

 capsule oblong-globose, long-exserted. (Jungermannia divaricata, Smith.) 

 Dry rocks and sand, pine barrens of N. J., and northward. (Eu.) 



8. C. Macounii, Aust. Slender, much branched, dark green; leaves 

 scarcely broader than the stem, wide-spreading, bifid with a broad or lunate 

 sinus, the broad-subulate lobes mostly acute ; cells subquadrate, somewhat pel- 

 lucid ; dioecious ; involucral leaves appressed, 2 - 3-lobed, irregularly spinulose ; 

 perianth small, whitish, obovate or ovate-fusiform, obtusely 3-angled, setu- 

 lose or ciliate. Rotten logs, mountains of N. Eng., and northward (Austin, 

 Macoun). 



9. C. Sllllivantii, Aust. Stems 3 - 6" long, fleshy, rootlets numerous; 

 fertile branches suberect, clavate ; leaves imbricate, often narrower than th 

 stem, subquadrate-ovate, more or less serrate, the sinus and lobes subacute ; 

 dioecious ; involucral leaves 3, erect, free ; perianth broadly oval or subobovate, 

 obtusely and sparingly angled, the apex slightly plicate, the mouth connivent, 

 dentate, sometimes narrowly scarious ; capsule oval. On rotten wood, N. J., 

 Ohio, and 111. ; rare. Our smallest species. 



