420 MUSCI. Ilypnwm. 



lanceolate, long-acuminate, subdenticulate at the apex, nerveless or obscurely bicostate 

 at base ; quadrate alar cells few or none : flowers dioecious : capsule long-cylindric, 

 subcernuous, curved, with broad compound annulus and obtuse conic or sub- 

 rostellate operculum : ciliolse 2, a little shorter than the processes. Trans. Amer. 

 Phil. Soc. xiii. 14; Sulliv. & Lesq. Muse. Am.-Bor. Exsicc. 2 ed. n. 476; Sulliv. 

 Icon. Muse. Suppl. 103, t. 79. H.plumifer, Mitten, Journ. Linn. Soc. viii. 41, t. 7 1 



On shaded rocks in woods, at Oakland and in the Sierra Nevada (Bolander) ; Vancouver Island, 

 Lyall. Mitten's species appear to differ only in the somewhat more narrowly and acutely beaked 

 operculum. 



41. H. circinale, Hook. Stems creeping, slender, 2 to 4 inches long, flexuous, 

 simply pinnate, the numerous branches scarcely inch long, or sometimes 2 inches 

 long and flexuous : leaves secund, lanceolate with a long-subulate subserrate apex, 

 strongly circinnate, nerveless ; perichaetial leaves erect ; basal areolation vesicular, 

 yellow : capsule small, ovate upon a broad arcuate collum, horizontal or subpendu- 

 lous ; operculum short-conic : ciliolse 1 or 2, rather shorter than the processes. 

 Muse. Exot. t. 107; Sulliv. & Lesq. 1. c., n. 474. H. Sequoieti, Muell. in Flora, 

 1875, 91. 



In the Coast Ranges, on redwoods (Bolander) ; at the base of trees, Siskiyou Mountains 

 (Brewer) ; Washington Territory (Pickering) ; Vancouver Island, Lyall, Menzics. 



* * * Stem prostrate and ascending, irregularly branched : leaves secund or 

 spreading everyway, broadly ovate to long-lanceolate, shortly or obsoletdy 1-2- 

 costate, areolation very narrowly linear. LIMNOBIUM. 



42. H. arcticum, Sommerf. Branches elongated, crowded, simple, rigid, obtuse, 

 1 or 2 inches long or more : leaves reddish or yellowish brown, widely spreading, 

 roundish, subacute or obtuse, entire, bicostate to the middle, areolation not dilated 

 at the angles : flowers monoacious : capsule suberect or cernuous, oval upon a dis- 

 tinct narrow collum, arcnate when dry ; annulus double ; operculum short-conic, 

 acute : ciliolse short. Wahl. Fl. Lapp. Suppl. t. 2 ; Bruch & Schimp. 1. c., t. 578 ; 

 Wilson, 1. c., t. 56 ; Berkeley, Brit. Moss. t. 7, fig. 3. 



On Mount Dana, in streams, submerged (Bolander) ; Oregon (Hall) ; Rocky Mountains of 

 British America (Drummond) ; Europe. 



H. EUGYRIUM, Schimp. Leaves broadly ovate- to oblong-lanceolate, shortly acuminate, sub- 

 falcate-secund, more or less complicate and contorted, shortly bicostate, the alar areolation large, 

 pellucid and yellow : flowers monoecious : capsule ovate-oblong, cenmous-incurved ; annulus very 

 broad: ciliolae nodose. Sulliv. & Lesq. 1. c., n. 303 (2 ed. n. 450). Limnobium eugyrium, 

 Bruch & Schimp. 1. c., t. 579. Oregon (Hall) ; in the Alleghanies and White Mountains ; also 

 in Europe. 



H. OCHRACEUM, Turner. Stem and branches elongated : leaves falcate-secund, ovate- to 

 elongated oblong-lanceolate, short- or long-acuminate, more or less contorted, striate, costa single 

 or forked, reaching to the middle ; perichaetium squarrose : flowers dioecious : capsule ovate or 

 oblong, arcuate upon an erect attenuate collum ; annulus broad, triple : ciliolae very slender. 

 Wilson, 1. c., t. 58 ; Sulliv. & Lesq. 1. c., n. 305. Limnobium ochraceum, Bruch & Schimp. 

 1. c., t. 580. Oregon (Hall) ; White Mountains ; Europe. 



* * * * Stems pinnately or bipinnately branched: leaves shining, ovate-cordate 

 to oblong, spreading every way or rarely secund, shortly costate : dioecious. 

 HYLOCOMIUM. 



H. SPLENDENS, Hedw. Stems 2 to 6 inches long, interruptedly 2-3-pinnate, villous : stem- 

 leaves broadly ovate-oblong, cirrhose-acuminate, concave, serrulate, margin below recurved, bi- 

 costate at base : capsule ovate, cernuous, curved ; operculum with slender acute beak. Spec, 

 t. 67 ; Engl. Bot. t. 1424. Hyhcomimn splendens, Schimp. Bryol. Eur. t. 487. Oregon (Pick- 

 ering, Newberry, Hall) ; Vancouver Island (Lyall, Wood) ; Atlantic States and Europe. 



H. TRIQUETRUM, Linn. Stem erect, 6 inches high or more, ngid, subpinnate, with drooping 

 branches an inch long : leaves squarrose, triangular-acuminate from a cordate clasping base, 

 plicate-striate and bicostate to the middle, serrulate above : capsule roundish ovate, gibbous, 

 cernuous ; annulus simple ; operculum conic-mamillate. Engl. Bot. t. 1622. Hylocomiiuit 

 triquetrum, Schimp. 1. c., t. 491. 



Cascade Mountains, Oregon (Newberry) ; Columbia River (Hall) ; Europe. 



