musci. (jiossks.) 669 



fcate at the base, sen-ate ; 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 ; pedieels long. (H. fimbri 

 atum, Hartin. Shand. Flora, 1849. H. Pyreuaicum, Spruce, in Ann. Nat. Hist. 

 1849.) — White Mountains of New Hampshire, Oakes. — Intermediate between 

 H. umbratum and H. brevirostrc: larger than cither. (Eu.) 



* 5. THAMNIUM, Bryol. Europ.. — Primary stems rhizomalike; secondary ones 

 arcuuie-erect, below leafless, above simple, flat-branched, somewhat dendroid: leai-es 

 ovate-lameolate ; areohitien minute, elliptical ; costa stout, subconfinuous : capsule 

 turqid, suboval, unequal, cemuous: operculum rostrate: pedicels short, aggregated. 



15. H. AIEeglssmieilSe, C. Mull. Hermaphrodite; leaves dark green, 

 strongly serrated al>ove, as is the costa on the back. — Rocky margins of moun- 

 tain rivulets. 



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

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

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

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



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

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

 tricts: rare. (Eu.) 



§ 7. EURHYNCHIUM, Bryol. Europ- — Stems prostrate, extended, irregularly 

 subpinnately or fasciculate! y branched: leaves loose or imbricating, ovate or oblong, 

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

 equal, ces'niKius: opejxulum conic, usually long-rostnUe: pedicel smooth or scabrous. 



# Pedicel rough. 



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

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

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

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



18. H. SislliVisaatii. Spruce. Dicecious ; 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 rcflexcd below ; rostrum of the 

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

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



* * Pedicels smooth. 



19. M. Strigdsum, Hoffm. Pseudo-moncecious ; stem creeping, stolo- 

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

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



