376 BRYACE.E. [Ili/pnum. 



pedicellate, narrowed to a distinct collum ; operculum conical, 

 acute or short-rostellate ; teeth pale yellow ; segments slightly 

 cleft along the keel ; cilia single, very shoi't ; annulus simple. — 

 Syn. ii. 408; Sulliv. Icon. Muse. 201, t. 123. Ifi/pnum serpens, 

 var. compacticm, Drumm. Muse. Amer. n. 188. Stereodon com- 

 pactus, Mitt. 1. c. 



Hab. On decayed wood; British America (jDrianmond) ', Fort Colville 

 {Lyall); Nevada (Watson); Outario, Canada (Macoun). 



Ambbjstegium serratum, Bruch & Scliimp. (Bryol. Eur. Amhlystegium, 

 11; Sulliv. Mosses of U. States, 78), probably belongs to this species. 



126. H. Lescurii, Sulliv. Tufts loose, dark gi-een or black ; 

 stems prostrate, defoliate at base, irregularly branching and 

 ramulose ; branchlets close, unequal : leaves loosely imbricate, 

 erect-spreading, thick, opaque, serrulate all around the borders, 

 those of the stem broadly ovate-cordate, abruptly short-acumi- 

 nate, those of the branches narrower and ovate-lanceolate, all 

 concave with a j-ellowish border formed of 4 or 5 rows of flex- 

 uous linear cells ; costa very thick, vanishing in the apex ; cells 

 hexagonal-oblong, chlorophyllose ; pericluetial leaves erect, ob- 

 long-lanceolate, cuspidate by the excurrent costa, striate length- 

 wise : capsule oblong, cernuous or subincurved, short-necked ; 

 pedicel 1 to 3 cm. long, reddish ; lid convex-conical, apiculate; 

 teeth golden yellow, connate at base ; segments dehiscent along 

 the keel ; cilia two, stout, nearly as long as the segments ; 

 9,nnulus large, compound. — Mosses of U. States, 79, and Icon. 

 Muse. 203, t. 24 ; Sulliv. & Lesq. Muse. Bor.-Amer. Exsicc. n. 350. 



Hab. On moist rocks; first found at Tallulali Falls, Georgia (Les- 

 quereux)\ afterwi.rds in most of the Middle States, from Maine to Penn- 

 sylvania; not common. 



* * Plants loosely cespitose: leaves soft, decurrent ; areolation 

 rhombic-hexagonal, loose at base, rectangidar at the angles. 



127. H. riparium, Linn. Growing in wide loose soft dirty 

 or yellowish green flat tufts ; stems long, sometimes very long, 

 creeping or floating, flaccid, with few branches, irregularly 

 ramulose : leaves crowded or distant, generally'distichous, some- 

 times subsecund, shortly decurrent, broadly ovate or oblong- 

 lanceolate or sagittate, excavate at the basilar angles, more or 

 less narrowly and long-acuminate, very entire, costate to above 

 the middle ; areolation narrowly rhomboidal, loosely quadrate 

 at the angles, with the primordial utricles very distinct, espe- 



