MUSCI. (MOSSES.) 673 



$12. HARPfDIUM, Sulliv. Stems rootless, ascending, fastiy lately divided; di 

 visions long, subpinnately branclted ; branches more or less hooked-curved; leaves 

 Jiiiformly attenuated, falcate-secund, subcontinuously costate ; texture membrana- 

 ceous, firm ; areolation minute, linear: capsule oblong, cylindrical, erect-cernuous : 

 pedicels long: operculum short, convex-conic: mostly marsh-sjxcies. 



40. H. unciliatlini, Hcdw. Monoecious; stems 2'- 4' long, somewhat 

 rigid ; leaves crowded, gradually lanceolate-subulate from a broad base, plicate- 

 striate, serrulate, costate beyond the middle ; capsule cylindrical, erect-cernuous ; 

 annulus broad. Rocks and decayed logs, in moist places, White Mountains of 

 New Hampshire, Oakes. Forms large, loose, pale yellowish-green turfs. (Eu.) 



41. H. rcvolvens, Swartz. Monoecious; distinguished from the pre- 

 ceding by its softer, dark purple, larger, more linear leaves, when dry rather tor- 

 tuous, not plicate, with a shorter costa : and by its somewhat incurved oblong 

 capsule. Marshes and bogs, Northern Ohio. (Eu.) 



42. II. fluitans, L. Monoscious ; stems longer than in the last two spe- 

 cies ; stem-leaves elongated-lanceolate, remote, flaccid, often not falcate-secund, 

 costate nearly to the point ; capsule turgid-oblong, incurved-horizontal, with a 

 distinct erect collum ; annulus absent. Swamps and stagnant water. Color 

 usually dark green. (Eu.) 



43. H. acli'mc H in, Hedw. Dioecious ; typical form slenderer than in 

 the three species above ; leaves broadly ovate-lanceolate, acuminate, with a short 

 compressed costa reaching nearly to the point, and a somewhat rectangular are- 

 olation ; alar cellules large, inflated, pellucid ; capsule turgid, incurved-oblong. 

 Swamps and bogs. Var. GRACILESCENS, Bryol. Europ. Stems more deli- 

 cate; leaves shorter, with a looser areolation. Limestone springs, Penn., Le- 

 quereux. Var.? GIGA.NTEUM, Bryol. Europ. " Ethans Pond," Willey Moun- 

 tain, New Hampshire, James. St. Paul, Minnesota, Lesquereux. (Eu.) 



13. CRATONEtTRON, Sulliv. Stems prostrate or ascending, villous and 

 densely radiculose : the divisions few, interruptedly pinnate : leaves lanceolate or 

 lanceolate-attenuated from a cordate base, spreading or falcate-secund ; areolation 

 dense, oldong ; costa stout, subcontinuous : capsule cylindrical, cemuous : operculum 

 short-conic. Mostly in wet places, on calcareous soil. 



44. H. filiciiium, L. Dioecious ; leaves evenly concave ; annulus sim- 

 ple. Wet places, on dripping rocks, Ohio. H. commutatum, ///>., a 

 closely related species found in British America, is a somewhat larger plant ; 

 having the leaves softer, longer-attenuated, plicate, and more falcate, with a 

 shorter costa, and a large compound annulus. (Eu.) 



$ 14. PTlLIUM, Sulliv. Stems erect, large, rigid, rootless, villous, simple or 

 dic/iotomous, with one or two short innovations, densely cristate-pinnate, frond-like : 

 leaves ovate-lanceolate, attenuated, circinnate-secund, obsoletely bicostate, sulcate, 

 areolation minute, linear : capsule cylindrical, incurved-liorizontal : operculum con- 

 vex-conic : pedicels long. 



45. H. Crisfa-Castrensis, L. Dioecious ; leaves yellowish or ful- 

 vous, shining. On the ground in mountainous districts ; a striking, showy 

 species, sometimes forming deep spongy beds, many rods in extent. (Eu.) 



57 



