Bacomitrium.] BRYACE^. 147 



late, long-lacerate or split to below the middle, erect when dry ; 

 annulus very broad, of a triple row of cells. — Scot. Crypt. FI. 

 t. 123 ; Bryol. Eur. t. 260. 



Hab. Rocky Mountains {Driimmond); Bear River Gap, White Moun- 

 tains {James}', Nipogon River, Lake Superior {A. Smith); Thunder Bay 

 (Macoun). 



47. RACOMITRIUM, Brid. (PI. 2.) 

 Plants generally of large size, widely and loosely cespitose, 

 scarcely radiculose, branching by dichotomous innovations, 

 simple and fastigiate or fasciculate by lateral more or less un- 

 equal branchlets. Leaves close, nearly equal, not tufted at the 

 top of the stems, long-lanceolate, muticous or piliferous, canalic- 

 ulate-concave, recurved on the borders ; cells close, minutely 

 quadrate in the upper part of the leaves, sinuous, linear 

 and long in the lower part. Flowers dioecious. Fruit acro- 

 genous or from secondary short branchlets. Calyptra conical 

 at base and mitriform-subulate. Capsule oblong-cylindrical, 

 narrowed at the orifice, mostly erect. Lid narrow, subulate. 

 Teeth of the peristome long, irregularly 2-3-cleft to below the 

 middle or divided into two filiform nodose nearly equal seg- 

 ments, erect, rarely spreading when dry. Annulus compound, 

 revoluble. 



Subgenus I. CAMPYLODRYPTODOK 



Plants regularly dichotomous, prostrate. Cells minute and 

 rounded above, linear toward the base : costa narrowly two- 

 winged above on the back. Pedicel arcuate. Teeth long, bifid 

 to near the base. 



1. R. patens, Hueben. Plants olive-green, fragile, in wide 

 loose flat tufts : leaves open, long-lanceolate, muticous ; costa 

 subpercurrent : capsule inclined or pendent, emergent, oval, 

 yellowish brown, red at the orifice ; lid straight or obliquely 

 rostrate ; teeth purple, papillose ; membrane orange ; annulus 

 very broad. — Muse. Germ. 199; Schimp. Syn. 226. Hn/um 

 pate?is, Dicks. Fasc. Crypt, ii. 6, t. 4. Trichostomum patens^ 

 Schwaegr. Suppl. i. 151, t. 37. Bryptodon patens^ Brid. Bryol. 



