720 JUNGERMANNIACE^E. (SCALE-MOSSES.) 



9. 3. ventricbsa, Dicks. Stems dense, close-creeping, branching from 

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

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

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

 plicate above; capsule oval. On the ground and rotten wood 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 bideutate with au obtuse sinus, or acute in the 

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

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

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



-t- -i- 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, Attst. ; 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-clef t ; 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 ; iuvolucral 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. SPHENOLOBUS. Leaves 2-lobed, subtransverse, complicate-concave ; 

 underleases 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; iuvolucral 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. minuta, 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, and northward. (Eu.) 



