Hypnum. MUSCI. 417 



(an inch long from the base of the branches) ; operculum acute-conic : teeth reddish 

 brown, the solitary ciliolse as long. Hedw. Muse. Frond, iv. 81, t. 31 ; Engl. Bot. 

 t. 1260 ; Wilson, 1. c., t. 24; Berkeley, 1. c., t. 12, tig. 2. Plagiothedum denticula- 

 tum, Bruch & Schimp. 1. c., t. 501. 



In the Coast Ranges, Mendocino City, and on redwood trees in Jackson Valley (Bolander) ; 

 Fort Colville (Lyall) ; in the White Mountains and Europe. 



31. H. undulatum, Linn. Procumbent, sometimes 6 inches long or more, the 

 usually simple branches 2 inches long or more : leaves whitish, crowded, ovate, 

 acute, transversely undulate, entire, one or both margins incurved at base, shortly 

 bicostate, areolation very narrow : flowers dioecious : capsule subcylindric upon a 

 pedicel 2 inches long, curved, striate when dry, brownish yellow ; operculum acute 

 or rostellate : teeth yellowish ; ciliolse 3, slightly shorter. Schwaegr. Suppl. t. 282; 

 Wilson, 1. c. ; Berkeley, 1. c., fig. 4. Plagiothedum undulatum, Bruch & Schimp. 

 1. c., t. 506. 



Swamps near the coast, Mendocino County (Bolander) ; Oregon (Newberry) ; Fort Nisqually 

 (Pickering) ; Fort Colville (Lyall) ; Europe. 



H. ROBUSTUM, Hook. Stem creeping, with very stout decumbent densely leafy broad flattened 

 branches, 6 inches long or more : leaves yellowish, falcate-secund, lanceolate, narrowly acuminate, 

 striate, transversely undulate, bicostate at base, serrulate at the apex : capsule ovate-oblong, 

 arcuate-horizontal on a pedicel an inch long. Muse. Exot. t. 108 ; Schwaegr. Suppl. t. 261. 

 Stereodon robustus, Mitten, Journ. Linn. Soc. viii. 41. Oregon (Hall, Alohr) ; Rocky Mountains 

 (Drummond) ; also by Menzies. 



H. PULCHELLUM, Dicks. Small, branches erect, scarcely a half-inch long : leaves subfalcate- 

 secund, broadly lanceolate, narrowly attenuate, entire, nerveless, areolation very narrow : capsule 

 oblong, suberect ; operculum convex-conic : teeth pale yellow ; ciliol.e in pairs. Engl. Bot. 

 t. 2006; Wilson, 1. c., t. 25 ; Berkeley, 1. c. fig. 1. Lcskea pulchella, Hedw. Spec. t. 55. Plagio- 

 thecium pulchellum, Bruch & Schimp. 1. c., t. 497. Fort Colville (Lyall); Europe. 



H. TURFACEUM, Liudb. A similar slender species, with depressed-complicate and somewhat 

 folded rather long-acuminate leaves serrate to the middle and nerveless : capsule oblong-cylindric, 

 symmetrical, cernuous, sulcate when dry; ciliolas one or two, long. Fl. Dan. Suppl. t. 117. 

 Fort Colville (Lyall) ; Europe. 



H. ELEGAXS, Hook. Stems procumbent, 1 \ inches long : leaves distichously imbricated, ovate- 

 lanceolate, acuminate, nerveless or obscurely 2-nerved at base, serrulate at the apex, areolation 

 very narrow : capsule pendulous upon a short arcuate pedicel, oblong-ovate, nearly symmetri- 

 cal ; operculum broad, abruptly rostellate : ciliolre 3, equalling the processes. Muse. Exot. t. 9 ; 

 Schwaegr. Suppl. t. 282 ; Wilson, 1. c., t. 59 ; Berkeley, 1. c. tig. 2. Vancouver Island (Menzies) ; 

 White Mountains ; Great Britain. 



H. SYLVATICUM, Linn. Resembling H. denticulatum, but stouter and with duller darker 

 green foliage, the leaves less complanate, not acuminate : flowers dioecious : operculum long-conic. 

 Schwaegr. Suppl. t. 87; Wilson, Engl. Bot. Suppl. t. 2936, and 1. c., t. 59. Playiotliecium 

 sylvaticum, Bruch & Schimp. 1. c., t. 503. Oregon (Hall) ; White Mountains ; Europe. 



i -t Peristome-teeth remotely jointed / ciliolce none. 



H. TRICHOPHORUM, Spruce. Resembling H. dcnticulatum, but more slender : leaves less com- 

 planate and less spreading, sulcate, pilose-apiculate : capsule narrower, suberect or erect when 

 dry. Plagiothedum piliferum, Bruch & Schimp. 1. c., t. 496. Oregon (Hall); Rocky Moun- 

 tains of British America (Drummond) ; Europe. 



* * Creeping, irregularly branched, never stoloniferous : leaves dull or shining, 

 spreading or subsecund, ovate-lanceolate to lanceolate, costate to above the middle ; 

 areolation rather loose, not linear nor flexuose : monoecious. AMBLYSTEGIUM. 

 (Amblystegium, Schimp.) 



Leaves dull : areolation wholly parenchymatous. 



32. H. compactum, Muell. Stems slender, mostly erect, an inch long or 

 more, in broad very compact tufts, fasciculately branched : leaves erect-spreading, 

 rarely subsecund, narrowly ovate-lanceolate and acuminate, slightly serrulate espe- 

 cially toward the base, the stout costa continuous nearly to the apex : areolation nar- 

 rowly rhombic and subflexuose, subquadrate at the angles : capsule slightly inclined 

 on an elongated pedicel, oblong with distinct collum, slightly incurved, contracted 



