,720 JUNGERMANNIACE^E. (SC ALE-MOSSES.) 



9. J. ventric6sa, Dicks. Stems dense, close-creeping, branching from 

 beneath; leaves semi-vertical, subquadrate, mostly flat, broadly and acutely 

 emarginate-bidentate, often bearing globules ; involucral leaves larger, round, 

 erect-spreading, 3 - 4-clef t, subdentate ; perianth ovate, inflated, narrowly com- 

 plicate above ; capsule oval. On the ground and rotten woocl in the moun- 

 tains, and far northward; common. (Eu.) 



10. J. Wallrothiana, Nees. Minute, blackish ; stems creeping, strongly 

 rooting, subsimple ; leaves clasping, semi-vertical, closely imbricate, ovate- 

 quadrate, concave, obtusely bidentate with an obtuse sinus, or acute in the 

 upper leaves ; involucral leaves larger, erect, connate at base, 3-toothed, wavy- 

 plicate ; perianth oval-cylindric, plicate and subdentate, pellucid, reddish below. 

 On coarse sand in the White Mts. (Oakes). (Eu.) 



t- H- Leaves bifid or 2-lobed, the ventral lobe often inflexed or subcomplicate ; 

 involucral leaves merely toothed, except in n. 11. 



11. J. laxa, Lindb. Widely creeping, mostly simple, usually purplish- 

 black ; leaves imbricate, or distant on the erect fertile stems, 2 - 3-lobed, the 

 lobes obtuse, wavy ; cells very large, lax ; involucral leaves 2, wide, short, 

 cristate-undulate, obtusely many-lobed ; perianth exserted, long-clavate, sub- 

 plicate above, minutely ciliate. ( J. polita, Aust. ; not Nees.) Among Sphag- 

 num near Closter, N. J. (Austin). 



12. J. excisa, Dicks. Stems closely creeping, short, subsimple, rather 

 rigid ; leaves semi-vertical, erect-spreading, pellucid, roundish, with straight 

 acute lobes and deep obtuse sinus ; involucral leaves erect, quadrate, usually 

 4 - 5-toothed ; perianth erect, oblong, pale, banded and spotted with pink, pli- 

 cate above, irregularly denticulate. Sterile grounds in open woods ; com- 

 mon. (Eu.) 



Var. crispa, Hook. Leaves round-quadrate, closely imbricate, deeply and 

 obtusely 2 - 3-cleft ; involucral leaves 3 - 4-cleft, connate at base, subserrate. 

 (J. intermedia, Lindenb.) In crevices of rocks, N. Y. and N. J. (Austin). (Eu.) 



13. J. incisa, Schrad. Stems thick, rooting, closely creeping or ascend- 

 ing; leaves crowded, semi-vertical, complicate, subquadrate, 2-6-cleft, the 

 acute lobes unequal, more or less spinulose-dentate ; involucral leaves similar, 

 more plicate and dentate, free ; perianth short, oval or obovate, plicate above, 

 denticulate. On rotten wood in the mountains, and northward. (Eu.) 



3. SPHEN6LOBUS. Leaves 2-lobed, subtransverse, complicate-concave ; 

 underleaves none; involucral leaves 2 -3-cleft. (Verging toward Marsu- 

 pella on one side and Diplophyllum on the other.) 



14. J. Michauxii, Weber. Stems ascending, flexuous by repeated 

 innovations below the summit; leaves crowded, subvertical, erect-spreading, 

 subsaccate at base, subquadrate, bifid with straight acute lobes and a narrow 

 sinus ; involucral leaves similar, the outer serrulate, the inner smaller ; peri- 

 anth ovate-subclavate, obtuse, plicate above, fringed. Fallen trunks, moun- 

 tains of N. Y. and N. Eng. ; common. (Eu.) 



15. J. mintlta, Crantz. Rootless; leaves cleft - their length, the 

 lobes ovate, subequal, acute or obtuse, entire, or gemmiparous ones subdentate ; 

 involucral leaves trifid ; perianth oval-oblong or subcyliudric. On rocks in 

 high mountain regions, arid northward. (Eu.) 



