Leptotrichum.] BRYACE^. 105 



vanishing with or below the apex ; areolation distinct, rect- 

 angular, a little enlarged in the lower part; perichastial 

 leaves erect, similar, with a loose areolation : lid conical, acu- 

 minate or blunt, inclined or erect, variable in length; teeth 

 irregular, simple or variously divided, sometimes rudimentary; 

 basilar membrane none ; annulus very narrow, persistent. — 

 Spreng. Syst. iv. 173 ; Bryol. Eur. t. 186. Trichostomum 

 luridum, Spruce ; Lindb. Trichost. 226. 



Var. cuspidatus, Schimp. Leaves cuspidate by the ex- 

 current nerve. 



Hab. Niagara Falls {Drummond, Clinton); Minnesota (Lapham); 

 abundant on limestone rocks washed by spray, northern shores of Kelly 

 Island, Lake Erie (Lesquereux). 



3. D. cylindricus, Bruch & Schimp. Dioecious: loosely 

 cespitose, pale green : leaves long, open, flexuous, linear- 

 acuminate, twisted when dry, whitish at the base, fragile, flat, 

 opaquc-verruculose above, minutely crenulate on the borders, 

 or with a few distinct teeth near the apex; costa narrow, ex- 

 current into a short point: capsule narrowly cylindrical, on a 

 long pale soft pedicel; lid long-rostrate, subulate; teetli nar- 

 rowly linear-lanceolate, entire or diversely lacerate-perforate, 

 fugacious; annulus narrow, persistent. — Bryol. Eur. t. 187. 

 Weisia cylindrica, Bruch ; Brid. Bryol. Univ. i. 806. Weisia 

 tenuirostris, Hook & Tayl. Muse. Brit. (2 ed.) 83, t. 3, Suppl. 

 Trichostommn temiirostre, Lindb. Trichost. 225. 



Hab. On old wood and twigs, Chester Co., Pennsylvania, and in the 

 Alleghany, Catskill and White Mountains {James); Ontario, Canada 

 (Mrs. Roy) ; rarely fertile. 



4L LEPTOTRICHUM, Hampe. (PL 1.) 

 Plants slender. Leaves smooth, lanceolate-subulate ; areola- 

 tion narrowly rectangular above, looser hexagonal-rectangular 

 below. Capsule oval or cylindrical, erect, on a long straight 

 rarely flexuous pedicel. Teeth of the peristome cleft to the base 

 into two linear articulate segments, erect or a little inclined to 

 one side, purple. Annulus compound, deciduous. 



* Flowers dioecious. 



1. L. tortile, Muell. Plants short: leaves secund or spread- 

 ing, lanceolate-subulate ; borders recurved in the middle ; costa 



