MUSCI. (MOSSES.) 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 

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

 aturn, Hart m. Skand. Flora, 1849. H. Pyrenaicum, Spruce, in Ann. Nat. Hist. 

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

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



5. THAMNIUM, Bryol. Europ. Primary stems rhizoma-like : secondary ones 

 arcuate-erect, below l&ifless, above simple, flat-branched, somewhat dendroid: leaves 

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

 turgid, suboval, unequal, cernuous : operculum rostrate : pedicels short, a(/gregated. 



t5. H. AllegrlianienSC, C. 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 irregular fasciculate 

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

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



16. H. inyosuroides, 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 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. 



1 7. H. lliailS, 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. Sullivaiitii, Spruce. Dioecious; smaller than the last, with a 

 condensed and subfasciculatc 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. $ Hook, in Drum. S. 

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



* # Pedicels smooth. 



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

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

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



