JUNGERMANNIACE^E. (SCALE-MOSSES.) 715 



16. DIPLOPHYLLUM, Dumort. (PL 25.) 

 Leaves rather narrow, complicate-bilobed, the lobes subequal or the upper 

 smaller, the lower succubous; underleaves none. Fruit terminal. Involu- 

 cral leaves few. Perianth cylindrical, scarcely or not at all compressed, pluri- 

 plicate, denticulate. (Name from SnrAos, double, and <j>v\\ov, leaf, on account 

 of the folded 2-lobed leaves.) 



1. D. albicans, Dumort., var. taxif61ium, Nees. Stems ascending, 

 almost rootless ; leaves closely folded, subdenticulate, with a rudimentary 

 pellucid line near the base or none, the lobes obtuse or acutish, the lowei 

 3blong-scymitar-shaped, the upper smaller, subovate ; perianth ovate, plicate. 

 (Jungermannia albicans and J. obtusifolia of Sulliv.; not of L. and Hook.) 

 Under rocks in mountain ravines and on the ground. (Eu.) The typical 

 form occurs in N. Scotia, distinguished by a broad pellucid median line in 

 both lobes. 



17. GE 6 CALYX, Nees. (PI. 23.) 



Leaves succubous, bidentate; underleaves 2-cleft, with linear divisions. 

 Fruit lateral, pendent. Involucre simple, fleshy, saccate, oblong, truncate, 

 attached to the stem by one side of the mouth. Calyptra membranous, 

 partly adnate to the involucre. Capsule oblong. Elaters free. Antheridia 

 in the axils of small leaves on spike-like lateral branches. (Name from yea, 

 the earth, and KCAU, a cup, from the subterranean involucres.) 



1 . G. grav^olens, Nees. Leaves ovate-quadrate, 2-toothed, light green ; 

 underleaves oval-lanceolate, cleft to the middle. On the ground, and rotten 

 logs ; not rare. (Eu.) 



18. LOPHOCOLEA, Dumort. (PI. 23.) 

 Leaves succubous, dorsally decurrent, obliquely ovate-oblong, broadly trun- 

 cate or bidentate ; underleaves smaller, more or less quadrate, bifid or with 

 4-8 capillary lobes. Dioecious or monoecious. Fruit terminal on the main 

 stem or primary branches. Involucral leaves 2-4, large, often spinulose; 

 perianth triangular-prismatic, 3-lobed, ciliate or laciniate. Calyptra short, 

 obovate, at length lacerate above. Capsule oblong-globose. Antheridia 

 mostly solitary in or near the base of ordinary leaves. (Name from \6(f>os, 

 a crest, and Ko\6s, a sheath, from the crested perianth.) 



* Underleaves mostly bifid (or 3-4-cleft in n. 1); divisions mostly entire. 



1. L. bidentata, Dumort. Stems 1-2' long, procumbent, sparsely 

 branching; leaves pale green, ovate-triangular, acutely 2-toothed, the teeth 

 oblique with a lunulate sinus ; monoecious ; perianth oblong-triangular, lacin- 

 iate ; antheridia 2 - 3 in a cluster, axillary. On rocks in shady rills ; not com- 

 mon. (Eu.) 



2. L. Austin!, Lindb. Creeping; leaves uniformly deeply lobed, the 

 lobes and usually the sinus acute ; underleaves comparatively small, the lobes 

 subulate ; cells small ; monoecious ; antheridia solitary in the upper axils. (L. 

 minor, Aust.; not Nees.) On roots of trees in woods (Austin). Imperfectly 

 known. 



3. L. Macounii, Aust, Stems very short, prostrate, ascending at the 



apex, densely radiculose ; leaves suberect, ovate-subquadrate, 2-lobed with ob- 

 31 



