ITypnum.] BKYACE^, 337 



Var. longisetum. Stems long, ascending, si^aringly ramu- 

 lose : leaves shorter and shorter-acuminate, indlstii.Ltiy serrate. 

 — Bruch & Schimp, 1. c, as Bracliytlieciian. 



Var. palustre. Stems tall, stout: leaves broader, more 

 concave, scarcely plicate, with a shorter point. — //. JSIildeanuni^ 

 Schimp. Syn. 694. 



Var. cylindricum. Stems appressed, pinnately ramulose : 

 leaves shorter, very glossy, pab : capsule erect, longer, sub- 

 arcuate. — Bruch & Schimp. 1. c. 



Var. Texanum. Stem-leaves abruptly subulate-acuminate, 

 the lower entire, the upper serrate : capsule oblong-cylindrical ; 

 pedicel thicker, pale-colored. — Aust. Bull. Torr. Club, vi. 44, 

 as Brachythecium. 



Hab. Moist ground, decaying trunks of trees, stones, etc., in the 

 woods; the first variety in more arid places; the second in swampy 

 ground; the next in South Carolina (i?a«eneZ); the last in Texas 

 {Boll). 



38. H. acutum, Mitt. Monoecious : plants loosely cespi- 

 tose, briglit glossy green : stems long, liexuons, cree])ing, rad- 

 iculose at base, sparingly branching ; branchlets short, very 

 open, often reflexed : leaves loose, open-spreading when mois- 

 tened, lanceolate, gradually long-pointed, distantly and ob- 

 scurely serrulate all around, subdecurrent and short-auriculate 

 at base, costate to above the middle ; basal cells loose, sub- 

 quadrate ; perichastial leaves narrowly subulate, recurved from 

 a short oval erect base, nei'ved : capsule oval, subinclined and 

 snbcernuous and unequal ; pedicel long ; operculum long-coni- 

 cal, apiculate or subulate ; teeth hyaline-bordered ; cilia two, 

 appendiculate. — Journ. Linn. Soc. viii. 32, t. 6, Braclvjthe- 

 chon aciitum, Sulliv. Icon. Muse. Suppl. 99, t. 75. 



Hab. Pack River, British Columbia {Lyall); Massachusetts (Greene). 



Closely resembling //. salebroswn, but differing from this and otlier 

 allied species in the leaves gradually narrowed from just above the base, 

 not narrowed and acuminate above, in tlie longer operculum, the teeth 

 bordered by a pellucid margin, and the appendiculate cilia. The species 

 is referred by Lindberg (Muse. Scand. 35) to H. Mildeanum, Schimp. 



39. H. albicans, Xeck. Dioecious : irregularly cespitose ; 

 tufts loose, soft, whitish green ; stems with few simple or spar- 

 ingly ramulose branches, terete : leaves close, more or less 

 densely imbricate, ovate-lanceolate, with a short subpilifonn 

 point, sulcate, costate to the middle, entire or subserrulate at 



