Musci. (mosses.) (55) 655 



so attenuated, nor the areolation so linear ; capsule cylindrical, its length only 

 2|- times its diameter, and with a perichsetial branch much longer ; teeth of the 

 peristome not cleft along the centre, articulations 20 - 25 ; cilia not so granu- 

 lated, more connected from their apices downwards by cross-bars : antheridia 

 3-5, large, projecting beyond the perigonial leaves, with long paraphyses. — 

 Falls of Little Eiver, Lookout Mountains, Alabama, Lesquereux. — Eruit rare. 



6. F. Dalecarlica, Bryol. Europ. Slender and much divided ; branch- 

 es numerous, elongated, somewhat julaceous ; leaves narrowly-lanceolate, con- 

 volute ; perichaetial leaves acute, the 3 inner ones recurved at the apex and long- 

 er than the ovate capsule ; operculum short ; teeth of the peristome perforated 

 between the 10-12 articulations; ciKa as in No. 3, but not granulated. — (F. 

 squamosa. Drum. Muse. Amer., No. 233; Muse. Alleghan,, No. 188.) — White 

 Mountains, OaJces, James; Eulton County, New York, D. E. Eaton. (Eu.) 



60. DICHEIilTMA, Myrin. Beook-Moss. (Tab. IV.) 



Calyptra dimidiate or cucullifoi-m, entire at the base. Operculum conic-ros- 

 trate. Capsule oval or oblong, pedicellate. Peristome double ; the exterior 16 

 linear teeth perforated along the medial line; the interior 16 cilia longer than 

 the teeth, and more or less connected by cross-bars. Liflorescence dioecious. — 

 Stems slender, floating in water, sparingly divided and branched; leaves 3- 

 ranked, much elongated, with a percurrent costa, those of the perichseth very 

 conspicuous and ecostate. (Name fi-om Sip^ato, to divide, and eXvfia, a veil, in 

 allusion to the cleft or cuculliform calyptra.) 



1. D. falcatuni, Myrin. Leaves lanceolate-subulate, complicate-cari- 

 nate, falcate-secund ; the inner perichsetial leaves very much elongated, closely 

 wrapped around the lower half of the long pedicel ; capsule oval-oblong ; inner 

 peristome a tessellated truncated cone ; calyptra dimidiate, elongated, clasping 

 the pedicel. — Head-waters of the Saco Eiver, White Mountains, New Hamp- 

 shixe, James: Brattleborough, Vermont, C. C.Frost, (Eu.) 



2. D. capillaceuni; Biyol. Europ. Branches few, widely spreading ; 

 leaves dark or yellowish-green, subulate from a narrow lanceolate base by the 

 long-excurrent costa, secund-falcate, denticulate at the apex ; those of the peri- 

 chseth convolute, overtopping the oval capsule which emerges laterally ; calyp- 

 tra dimidiate, extending below the capsule, and spirally convolute ; cilia of the 

 inner peristome connected at their apices only, — Rivulets, Pennsylvania and 

 northward. (Tab. IV.) (Eu.) 



3. D. pallesceos, Bryol. Europ. Much like No. 2, but smaller ; leaves 

 pale green, shorter, wider, more complicate-carinate, and more falcate, with a 

 larger areolation ; cilia of the iimer peristome not connected by cross-bars. — 

 (D. capillacea, Drum. Muse. Amer., No. 234.) — British America, Drummond. 



4. I>. SllltulatlllUj Myrin. Stems elongated, subpinnate ; branches 

 short, widely spreading ; leaves erect-patent, lanceolate, complicate-carinate, the 

 costa ceasing at the denticulate apex ; capsule ovate-oval, short-pedicelled, con- 

 cealed by the broad and straight perichsetial leaves ; calyptra cucuUiform, not 

 descending below the convex-rostellate operculum ; cilia of the inner peristome 

 free, except at their apices. — Louisiana, Drummond. 



