Musci. (mosses.) (69) 669 



tate at the base, serrate; operculum short-conic. — Shaded rocks; Alleghany 

 Mountains. (Eu.) 



14. H. Oakesii, Sulliv. (1848, and Mem. Amer. Acad. n. ser. 4, p. 

 173, t. 5.) Dioecious; stems with elongated, arcuate, subcompressed, distantly 

 ramulose innovations; branchlets incurved; leaves ovate-oblong, acuminate, 

 plicate, semicostate, the upper half sharply and irregularly dentate ; capsule 

 gibbose-ovate, drooping ; operculum conical, acute ; pedicels long. (H. fimbri- 

 atum, Hartm. Skand. Flora, 1849. H. Pyrenaicum, Spruce, in Ann. Nat. Hist. 

 1849.) — White Mountains of New Hampshire, Oa^es. — Intermediate between 

 H. umbratum and H. brevirostre ; larger than either. (Eu. ) 



§5. THAMNIUM, Bryol. Europ. — Primary stems rhizoma-like ; secondary ones 

 arcuate-erect, below leafless, above simple, flat-branched, somewhat dendroid: leaves 

 ovate-lanceolate; areolation minute, elliptical; costa stout, subcontinuous : capsule 

 turgid, suboval, unequal, cernuous : operculum rostrate: pedicels short, aggregated. 



15. H. Alleg'taaniense; C. MuU. Hermaphrodite; leaves dark green, 

 strongly serrated above, as is the costa on the back. — Kocky margins of moun- 

 tain rivulets. 



§ 6, ISOTHECIUM, Bryol. Europ. — Main stem prostrate, small-leaved ; the 

 principal branches ascending, below simple, above with an irregular fasciculate 

 ramification: leaves ovate-lanceolate, acuminate, semicostate; areolation minute, 

 linear, flexuous : capsule oblong, nearly erect, subequal : operculum rostrate. 



16. H. myosiiroides, L. Dioecious ; branchlets filiform, arcuate ; 

 leaves ovate-acuminate, serrulate. — Trunks of trees, and rocks, in hilly dis- 

 tricts : rare. (Eu.) 



§7. EUEHYNCHIUM, Bryol. Europ. — Stems prostrate, extended, irregularly 

 subpinnately or fasciculately branched : leaves loose or imbricating, ovate or oblong, 

 acuminate, unicostate; areolation oval-rhomboidal or elongated: capsule oval, un- 

 equal, cernuous : operculum conic, usually long-rostrate : pedicel smooth or scabrous. 

 * Pedicel rough. 



17. H. biaus, Hedw. Dioecious ; grows in thin loose patches ; stems 

 prostrate, elongated, distantly pinnated ; branchlets short, subcompressed ; 

 leaves roundish-ovate, serrulate, spreading, loose ; costa suddenly ceasing more 

 than half-way. — On the ground, in woods. 



18. H. §ilI1iva,iltii, Spruce. Dioecious ; smaller than the last, with a 

 condensed and subfasciculate mode of growth ; stems somewhat firm, stolonif- 

 erous ; branches ascending, subterete ; stem-leaves elongated-ovate, those of the . 

 branches linear-lanceolate, all long-acuminate, decurrent, denticulate, more or 

 less papillose, costate beyond the middle, margins reflexed below ; rostrum of the 

 operculum rather short. (H. graminicolor (Brid. ?), Wils. Sf Hook, in Drum. S. 

 Mosses, No. 133.) — Woods, on the banks of rivulets, Ohio and Pennsylvania. 



* * Pedicels smooth. 



19. H. Strigosum, Hoffm. Pseudo-monoecious; stem creeping, stolo- 

 niferous ; main branches arcuate-ascending, distichously or subfasciculately ram- 

 ulose ; branchlets attenuated ; leaves crowded, spreading, cordate, oblong-ovate. 



