416 MUSCI. Hypnum. 



base, costate to above the middle ; perichsetial leaves squarrose : capsule horizontal, 

 oblong and subcylindrical, contracted below the throat when dry : teeth orange ; 

 processes yellow, dehiscent ; ciliolie 1 or 2, a half shorter. Muse. Hib. t. 15, fig. 2 ; 

 Fl. Dan. t. 2562, fig. 2 ; Sulliv. & Lesq. Muse. Am.-Bor. Exsicc. 2 ed. n. 433. 

 Eurhynchium Stokesii, Bruch fc Schimp. 1. c., t. 526. 



On shaded ground and rocks, common (Bigclow, Bolander) ; Vancouver Island (Lyall, Wood) ; 

 Europe. 



27. H. Oreganum, Sulliv. Very near the last, but larger and more robust, the 

 creeping stems 6 to 12 inches long or more, once or twice divided, regularly and 

 closely pinnated : leaves thinner and firmer, the areolation longer and narrower ; 

 perichsetial leaves reflexed. Mem. Amer. Acad. n. ser. iv. 172, and Muse. Wilkes 

 Exp. 16, t. 13, B; Sulliv. & Lesq. 1. c., n. 434. 



On decaying logs or on the ground in forests (Biyelow, Brewer, Bolander) ; Puget Sound (Pick- 

 eriny) ; Vancouver Island, Wood. 



28. H. colpophyllum, Sulliv. Of similar habit, rather small : leaves scarious, 

 very concave, spreading, ovate, very shortly acuminate, margin flat, serrulate, costa 

 slender, the dentate tip excurrent above the middle, areolation very narrowly hex- 

 agonal-rhombic ; perichsetial leaves oblong-lanceolate, long-acuminate, nerveless, 

 spreading above : capsule oblong-cylindric, cernuous, slightly curved, twice longer 

 than the straight stout-beaked operculum : ciliolre 2, equalling the teeth. Eurhyn- 

 chium colpophyllum, Sulliv. Icon. Muse. Suppl. 95, t. 71. 



California, Bigelow. 



H ) Ramification fascicled and someivhat dendroid: leaves complanate: areo- 

 lation quadrate-rhombic above, narrowly oblong below : pedicels smooth. 

 THAMNIUM. (Thamnium, Schimp.) 



29. H. Bigelovii, Sulliv. Secondary stems arcuate-ascending, subfasciculately 

 branched, 1 to 1^ inches high, rather stiff, in close mats: leaves bright green, 

 spreading in two ranks, long-oblong, shortly acuminate, coarsely serrate above, mar- 

 gin inflexed on one side, costa ceasing below the apex ; perichaetial leaves lanceolate, 

 linear-acuminate and serrate, suberect : flowers dioecious : capsule oblong-oval, in- 

 clined, with distinct collum, a little exceeding the straightish operculum : ciliolai 

 in pairs, strongly appendiculate, nearly equalling the processes. Pacif. E. Rep. iv. 

 189, t. 8 ; Sulliv. & Lesq. 1. c., n. 423. 



In valleys of the Coast Ranges north of the bay of San Francisco, on shaded rocks, Bigelow, 

 Brewer, Bolander. 



H. Ar.LEGHANiENsE, Muell. Larger, 2 or 3 inches high ; leaves less distinctly complanate, 

 ovate-oblong, more concave, obtusish, coarsely serrate, costa dentate on the back : flowers bisexual 

 or monoecious : operculum more oblique. Sulliv. Icon. Muse. 161, t. 103 ; Sulliv. & Lesq. 1. c., 

 n. 288. Thamnium AUeghanicnsc, Bruch & Schimp. //. neckeroides, Mitt, in Journ. Linn. Soc. 

 viii. 38, not Hook. Vancouver Island ( Wood) arid Atlantic States. 



3. Leaves smooth, mostly complanate or more or less secund, often shortly cos- 

 tate, bicostate, or nerveless : areolation mostly elongated rhombic : pedicels 

 smooth : operculum convex-conic. 



* Irregularly and sparingly branched, stoloniferous : leases shining, thin, dis- 

 tichously complanate, ovate or ovate-Lanceolate, nerveless or shortly bicostate, 

 usually entire ; areolation narrowly rhombic-hexagonal : mostly monoecious. 

 PLAGIOTHECIUM. (Plagiothecium, Schimp.) 



t Peristome-teeth closely jointed ; clllolce present. 



30. H. denticulatum, Linn. Stems prostrate, 2 or 3 inches long, with erect 

 subfasciculate branches : leaves light green and glossy, obliquely ovate, short-acumi- 

 nate, concave with margin recurved below, bicostate at base ; areolation long-rhombic, 

 quadrate at the angles : capsule arcuate-oblong or -cylindric, on a red curved pedicel 



