Hypnum.] BRYACE^. 3Q9 



lateral spreading, decurrent, broadly ovate-lanceolate, short- 

 acuminate, concave, obsoletely costate, very entire ; upper areo- 

 lation narrowly rhomboidal, gradually longer and narrower 

 downward ; the cells of the decurrent angles quadrate-oblong and 

 numerous : male j^l^ints mixed with tlie sterile or in separate 

 tufts ; perichaetial leaves short, oblong-lanceolate, acute or short- 

 acuminate : capsule long-pedicellate, cernuous and horizontal, 

 cylindrical, contracted into a long neck, sulcate, striate and 

 constricted under the orifice when dry ; operculum long-beaked, 

 the beak curved upward ; peristome large ; the teeth bright 

 orange at base; annulus double. — FL Angl. 419. Plagiotlie- 

 cium syloaticum, Bruch & Schimp. Bryol. Eur. t. 503 ; Lindb. 

 Faun. Flor. Fenn. ix. 28. 



Var. orthocladium. Branches shorter, erect, densely 

 crowded : leaves shoi'ter, less complanate, a little shining: cap- 

 sule oval, cernuous. — Schimp. Coroll. 115, as PlcKjiotheciicm. 

 P. orthocladium, Bruch & Schimp, Bryol. Eur. t. 504. 



Hab. Dense shaded rocks, and clayey ground in woods; the variety 

 more rarely found. 



110. H. undulatum, Linn. Dicecious : plants large, widely 

 cespitose, whitish green ; stems very long, prostrate and arcuate, 

 rooting at the base of the innovations ; branches curved down- 

 ward or ascending, densely foliate, tumid : leaves imbricate- 

 complanate, small and ovate toward the base, gradually larger 

 above and ovate-oblong, more or less abruptly acuminate, 

 naiTOwed and decurrent at base, transversely undulate-rugose 

 from the middle upward, serrulate at the apex, glossy ; costa 

 short, double ; areolation very narrowly rhomboidal, small and 

 quadrate at the decurrent angles; lower perichaetial leaves 

 recurved, the upper sheathing, longer acuminate, thin, narrowly 

 costate : capsule oblong-cylindrical, arcuate, deeply ribbed when 

 dry, enlarged at the orifice, dirty yellow, passing to brown with 

 age ; pedicel long, flexuous ; operculum large, rostrate ; seg- 

 ments slightly split along the keel ; cilia three, stout, nearly 

 as long as the segments; annulus double. — Spec. PI. 1124; 

 Schwaegr. Su])pl. iii. t. 282''- Plagiothecium. undulatum, Bruch 

 & Schimp. Bryol. Eur. t. 506 ; Lindb. 1. c. 27. Stereodon itndu- 

 latus. Mitt. 



Hab. On wet mossy ground, in deep woods; Oregon {Pickering, 

 Hall), and California (Bolander); Fort Colville (Lyall). 



