Dichelyma.] BRYACE^. 273 



1. D. falcatum, Myrin. Stems variable in length : leaves 



close, three-ranked, falcate-secund, entire or nearly so, bright 



green when young, then yellowish-glossy, blackish and opaque 



when old ; costa subpercurrent ; inner perichaitial leaves very 



long, tliong-shaped, twisted around the pedicel : calyptra closely 



enfolding the pedicel under the capsule, split open on one side, 



pale straAV-color : capsule oval-oblong, exserted on a slender 



pedicel ; lid as long as the capsule, conical-acuminate ; inner 



peristome finely latticed, briglit red. — Svensk. Acad. Handl. 



1832, 274, t. 6 ; Bryol. Eur. t. 433. Fontmalis falcata, Hedw. 



Muse. Frond, iii. 57, t. 24. 



Hab. Swift mountain streams; White Mountains, Catslcills, Adiron- 

 daclcs, etc. 



2. D. uncinatum, Mitt. Leaves three-ranked, falcate- 

 secund, lanceolate, gradually narrowed to the denticulate apex, 

 complicate costate ; borders minutely serrulate from the middle 

 upward ; outer perichsetial leaves convolute, oblong, obtuse, 

 the inner longer, more acute : capsule exserted, on a short ped- 

 icel, oval, subequal ; lid as long as the capsule, subulate : inner 

 peristome entirely latticed, a little longer than the outer. — 

 Journ. Linn, Soc. viii. 44. 



Hab. Fort Colville, Wasliington Territory (Lyall). 



Closely allied to D. falcatum, from wliicli it differs in tlie more slender 

 and more distinctly pinnately branched stems, and tlie more setaceous 

 leaves witli an excurrent costa, wliicli is smootli beyond tlie serrulate 

 margins, and denticulate only at its apex. The perichsetial leaves are not 

 twisted, and the inner peristome is a perfectly cancellate cone, exceeding 

 tlie outer teetli by about one-fifth of tlieir length. — {Mitten.) 



3. D. capillaceum, Brueh & Schimp. Of the same size 

 as the last ; branches distichous, few, divaricate, or one-sided : 

 leaves secund, less falcate, oval-lanceolate at base, long-linear 

 above, acuminate by the excurrent costa, serrate at the apex, 

 dirty green ; perichfetium very long, j^assing above the capsule; 

 pericha?tial leaves linear, thin, ecostate, pale yellow, twisted : 

 capsule emerging from the side of the perichaetium, small, thin, 

 pale, ovate, truncate after the falling off of the high conical 

 lid ; teeth narrowly linear, densely papillose ; cilia nearly as 

 large, longer than the teeth, constricted at the articulations, 

 united only near the apex by transverse divisions, papillose, 

 pale yellow. — Bryol. Eur. t. 436. I^otUinalis capillacea, 

 Dicks. Crypt. Ease. ii. 1. Nechera capillacea., Muell. Syn. ii. 



