MUSCI. (MOSSES.) G79 



55, 56, emend., but is a larger plant, the leaves narrower and entire, with a much 

 heavier costu. The true Swartzian H. fluviatile of Wils. Bryd. Brit. ; Bryol. 

 Europ. fasc. 62 - 64, is a soft and flaccid plant, the ramification not pinnate. 

 H. noterophilum appears not unlike H. filicinum, var. Vallisclausae, Bryol. Brit. 

 (H. Vallisclausae, Brid.), but differs in the inflorescence. 



78. II. riparilEin, Hedw. Monoacious; stems much elongated, the di- 

 visions distantly and subpinnately branched ; leaves usually remote, bifariously 

 directed, ovate and oblong-lanceolate, acuminate, entire, costate half-way ; thin ; 

 areo'ation minute, iinear-rhomboidal ; capsule oblong, cernuous. Common 

 about swamps ; also on stones in rivulets. Quite variable. (Eu.) 



79. II. poiygamtlill, Bryol. Europ. Staminate, pistillate, and her- 

 maphrodite flowers in clusters, and on the same stem ; stems procumbent or 

 ascending, irregularly and subpinnately branched ; leaves entire, spreading, sub- 

 squarrose, long and subulately acuminated from a concave, cordate, or ovate- 

 lanceolate base, the point variously directed, costate half-way, or more or less 

 distinctly bicostate at the base, scarious ; areolation minute, linear ; the cellules 

 at the decurrent angles enlarged, oblong; capsule oblong, cernuous, broadly 

 annulate. Swamps, British America, Drummond. Very much like H. stel- 

 latum, but somewhat smaller, and not so harsh a species. 



80. H. Lescurii, Sulliv. (Muse. Bor.-Amer. No. 350 ) Momecious ; 

 stems prostrate ; branches erect, simple or divided ; leaves lax, widely spread- 

 ing, broadly ovate, very shortly acuminated, concave, with a thickened yellowish 

 border composed of several lines of linear flexuous cellules, which elsewhere are 

 rhombic-oval ; costa stout, extending to the serrulate point; capsule oblong, 

 cernuous, broadly annulate ; operculum acutely conic. On wet rocks, Taflu- 

 lah Falls, Georgia, Lesquereux. Also Brattleborough, Vermont, Frost. 



$ 21. PLAGIOTHECIUM, Bryol. Europ. Stems procumbent or erect, sjxir- 

 inyly branched ; branches usually siibcompressed or complanate, elongated, assurgent, 

 mostly simple : leaves ovate and orate-lanceolate, more or less unsym metrical, ecos- 

 tate or shortly bicostate ; areolation elonguted-rhoinboidal, or linear and flexuous : 

 capsule oblique, cylindrical, moderately curved, sometimes oblong, erect, and equal. 

 # Inflorescence monoecious. 



81. H. rteilticillfitlim, L. Stems prostrate, 2' -3' long, stolon ifero us ; 

 leaves obliquely ovate-acuminate, shortly bicostate, decurrent, the margins nar- 

 rowly reflexed ; areolation narrow and elongated ; capside oblong inclined ; 

 operculum conic, acute; annulus large, compound: pedicel red. In loose 

 tufts, on tussocks, in swamps and crevices of moist rocks : variable. On the 

 White Mountains, N. Hampshire, occurs what may be a form of this species ; 

 but it is smaller, with an upright growth, and an erect regular and narrowly 

 annulate capsule ; according well with Plagiothecium laetum, as given in Bryol. 

 Europ., except that its inner peristome is ciliolate, and even in this respect not 

 differing from specimens received from W. P. Schimper under that name. (Eu.) 



82. H. ITIuhleiibeckii, Bryol. Europ. Stems scarcely 1' long, ascend- 

 ing ; branches short, arcuate-erect, fasciculate ; leaves complanate, ovate-lance- 

 olate, long-acuminate, sabsecund, serrulate, shortly bicostate, decurrent; cel- 

 lules at the basal angles large and inflated, elsewhere much smaller, elongated- 



