JUNGERMANNIACE.E. (SCALE-MOSSES.) 721 



16. J. Helleriana, Nees. (PI. 25.) Creeping, entangled ; leaves spread- 

 ing, su bast-ending, cleft J -^ their length, the lobes equal, acute, entire or ser- 

 rate ; iuvolucral leaves 2 - 3-clef t, spinulose-serrate ; perianth ovate, the mouth 

 contracted. On rotten wood, N. Y., N. Eng., and northward. (Eu.) 



4. GYMNOC6LEA. Leaves 2-lobed ; underleaves none; involucral leaves 

 like the cauline ; perianth pedunculate, denticulate. 



17. J. inflata, Huds. (PL 25.) Procumbent or ascending, loosely radicu- 

 lose, branching ; leaves semi-vertical, roundish-elliptic, inequilateral, the sinus 

 and unequal lobes obtuse ; perianth terminal or at length dorsal, oval or pyri- 

 form, smooth, the mouth connivent ; capsule oblong. On sterile ground and 

 rocks, N. J. (Austin), and northward in the mountains. (Eu.) 



25. MARSUPELLA, Dumort. (PI. 23.) 



Stems dorsally compressed, with rootlets at the base and often producing 

 somewhat leafless runners. Leaves transverse, complicate-bilobed ; involucral 

 leaves 2 or 4, connate with the perianth. Perianth tubular or oval, subcom- 

 pressed parallel to the base of the leaves. Elaters free. Spores round, rufous 

 (in our species). Antheridia mostly terminal. (Name a diminutive of mar- 

 supium, a pouch, from the form of the perianth.) 



1. M. sphacelata, Dumort. Stems erect, subflexuous, pale brown; 

 leaves rather distant, concave, obovate to obcordate, somewhat clasping, the 

 sinus narrow ; dioecious ; involucral leaves larger than the cauline, cordate ; 

 perianth free at the apex, with 4-5 broad acute teeth; antheridia 1-3, in 

 short terminal spikes. Wet rocks, mountains of N. Eng. to N. J., and south- 

 ward. (Eu.) 



2. M. emarginata, Dumort. (PI. 23.) Stems simple or innovating at 

 the summit, rigid, somewhat thickened upward ; leaves usually broader than 

 long, round-cordate or subquadrate, lobes obtuse or mucronate, sinus acute ; 

 dio3cious ; involucral leaves 4-8, usually larger, more deeply and acutely 

 emarginate ; perianth urceolate, the closed apex splitting into 4-5 triangular 

 lobes ; autheridia 2-3, oval, axillary in terminal spikes. (Sarcoscyphus Ehr- 

 harti, Corda.) On wet rocks, chiefly in mountain rivulets, N. Y. and N. Eng. 

 Floating forms are longer with distant leaves. (Eu.) 



3. M. adlista, Spruce. Stems minute, clavate; leaves (5-8 pairs) im- 

 bricate, round or broadly ovate from a sheathing base, acutely lobed with 

 angular sinus ; moncecious ; perianth included, campanulate, crenate becoming 

 irregularly lobed ; spores punctate ; antheridia 1 or 2, oval, in the axils of the 

 lower involucral leaves. (Gymnomitrium adustum, Nees.) Alpine region 

 of the White Mts. (Oakes, Austin). (Eu.) 



26. N A R D I A, S. F. Gray. (PI. 25.) 



Stems laterally compressed, usually without runners. Leaves succubous, 

 subconcave or flat, the apex rounded, rarely retuse or bidentate ; underleaves 

 none (in our species). Monoecious or dioecious. Involucral leaves 2-4 pairs, 

 connate at base. Perianth subcompressed laterally, connate with the involu- 

 cral leaves. Antheridia terminal on somewhat spike-like stems. (Named for 

 S. Nardi, an Italian abbot.) 



46 



