MUSCI. (MOSSES.) 69 
e base, serrate; operculum short-conic.— Shaded rocks; Alleghany 
Mountains. (Eu.) 
14. H. Oakésii, Sulliv. (1848, and Mem. Amer. Acad. n. ser. 4, p. 
173, t. 5.) Dicecious; stems with elongated, arcuate, subcompressed, distantl 
ramulose innovations; branchlets incurved; leaves ovate-oblong, acuminate, 
plicate, scmicostate, 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 Fen pubic, ‘ike . — Intermediate between 
H. umbratum and H. brevirostre; larger than either. (Eu.) 
45. THAMNIUM, Bryol. Europ. — Primary stems rhizoma-like ; secondary ones 
arcuate-erect, below leafless, above simple, flat-branched, somewhat dendroid: leaves 
ovate-lanceolate ; arcolation a elliptical ; costa stout, subcontinuous: capsule 
turgid, suboval, unequal, cer: operculum rostrate: pedicels short, aggregated. 
15. Hi. ee ae Mull. Hermaphrodite; leaves dark green, 
strongly serrated above, as is the costa on the back. — Rocky margins of moun- 
tain rivulets. 
§ 6. ISOTHECIUM, Bryol. Europ.— Main stem prostrate, small-leaved ; the 
principal branches ascending, below simple, above with an —— JSasciculate 
ramification: leaves ovate-lanceolate, acuminate, semicostate ; areolation minute, 
linear, gf aaa ule oblong, nearly erect, subequal : operculum rostrate. 
16. Hi. senna L. Diccious; branchlets ie arcuate ; 
leaves ovate-acuminate, serrulate.— Trunks of trees, and rocks, in hilly dis- 
tricts : rare. 3 
§7. EURHYNCHIUM, Bryol. Europ. — Stems prostrate, extended, gogbi 
subpinnately or * fasciculately bra nched : leaves loose or SE je vate or 
acuminate, unicostate; areolation oval-rhomboidal or elongat capsule oval, un- 
equal, cernucus : operculum conic, usually long-rostrate : a tancth or Nedra 
a 
17. Hi. hians, Hedw. Diccious; grows in thin loose patches; stems 
prostrate, elongated, distantly pimated coche short, subcompressed ; 
leaves roundish-ovate, serrulate, spreading, loose ; costa suddenly ceasing more 
than half-way. — On the eroahd, in sioae 
18. Hi. Sullivamtii, Spruce. Diccious; smaller than the last, with a 
condensed and subfascicukate mode of growth; stems somewhat tirm, stolonif- 
erous ; branches ding, subterete ; stem-leaves elongated-ovate, those of the 
branches near laneolte, - ———— Senne a more or 
less papillose 5 rostrum of the 
rather short. (H. graminicolor ( Brid. ?), Wils. § Hook. in Drum. S. 
Mosses, No. 133.) — Woods, on the banks of rivulets, Ohio and Peay franc : 
* Pedicels smooth. 
19. Hi. strigheum, Hofin Pseudo-moncecious ; st m creeping, stolo- 
niferous ; main branche distichously or sabhaciocac trad 
ulose ; branchlets attenuated ; leaves crowded, spreading, cordate, oblong-ovate, 
