678 MUSCI. (MOSSES.) 



72. H. minutissimum, Sulliv. & Lesqx. (Muse. Bor.-Amer. No. 343.) 

 Monoecious ; stems capillary, irregularly branched ; leaves ecostate, subentire, 

 those of the stem narrowly lanceolate from a broadly ovate base, widely spread- 

 ing ; branch-leaves much smaller, linear-lanceolate, subappressed ; capsule obo- 

 vate, inclined, cernuous ; operculum large, hemispherical-conic, apiculate ; an- 

 nulus simple, narrow ; inner peristome ciliolatc ; periehastial leaves strongly 

 and irregularly serrate. (Muse. Allcghan. No. 31.) — Grows with H. pygma- 

 um, in close, tbin, deep-green strata, on limestone rocks ; in shaded ravines, 

 Penn. and Ohio. — The smallest of our Hypna. Closely allied to H. confer- 

 voides, Schwazgr., and H. Sprucei, Bruck: the first is twice as large, and has a 

 pinnate ramification, an oblong capsule, and entire periehsetial leaves : the second 

 is dioecious, with ciliate-dentate perichastial leaves ; but in all other respects 

 (even in the capsule, which is erroneously described as erect and regular) it 

 approaches very near to this species. 



73. H. adlBBataasii, Hedw. Monoecious; leaves closely imbricated, ovate 

 and ovate-lanceolate, suddenly acuminated, concave, shortly bicostate, the mar- 

 gins nearly entire and refiexed below ; capsule oblong, erect-cernuous ; periehse- 

 tial leaves irregularly denticulate. — A small species, growing in thin, close 

 mats, on stones near the surface of the ground ; seldom on trees. 



74. H. §ei'g»CBB§, Hedw. Monoecious ; stems sparingly divided, closely 

 ramulose ; branches simple, filiform, unequal, flexuous-erect ; leaves spreading, 

 ovate-lanceolate, acuminate, entire or obsoletely serrulate, costate about half- 

 way ; areolation rather large and pellucid; capsule "elongated-cylindrical, cernu- 

 ous-incurved, broadly annulate. — On rocks, decayed logs, and the ground. — 

 Subject to many varieties. (Eu.) 



75. H. radicale, Brid. (Bryol. Europ.) Monoecious; closely related 

 to the preceding, but larger and more rigid ; leaves entire, longer and more 

 suddenly acuminated from a broader and rounder base, with a stouter costa 

 extending to the apex; areolation closer. (H. varium of authors.) — Same 

 localities as the last ; likewise very variable. — (In Bryol. Europ. a new species, 

 Amblystegium serratum, near this, is indicated, with smaller strongly serrated 

 leaves and a shorter costa : founded on specimens from Reading, Penn.) (Eu.) 



76. H. ortliocladoai, Beaur. Monoecious ; larger than H. radicale, 

 with longer, thicker, succulent, upright and straight branches (whence its spe- 

 cific name) ; leaves flaccid, entire, shorter-acuminate from a broad cordate 

 base; costa continuous ; areolation smaller. — Wet springy places. 



77. II. saotci'ugtBiilssnB, Sulliv. & Lesqx. (Muse. Bor.-Amer. No. 348.) 

 Monoecious ; divisions of the stem with an irregular pinnate ramification; leaves 

 of the fertile stems broadly ovate-lanceolate, shortly acuminate, erect-spreading, 

 with a strong excurrent costa; those of the thick and firm immersed sterile 

 stems erect, appressed, narrowly linear-lanceolate, gradually tapering from an 

 ovate base, long-cuspidate by the heavy costa, which occupies nearly § of the 

 lamina; capsule elongated-cylindrical, erect-incurved, narrowly annulate. (H. 

 fluviatile, James, in Proceed. Acad. Nat. Sci. Phil. 1855.) — Abounds in lime- 

 stone springs, Franklin County, Penn., Prof. Porter. — A stout, rigid, dark- 

 green Moss, resembling Amblystegium irriguum, var. fallax, Bryol. Europ. fuse. 



