BARNES NORTH AMERICAN MOSSES. 365 



ulate; alar cells large, reaching to costa which is simple and prolonged 

 above middle: inflorescence monoicous: capsules not found. Mac. Cat. 243. 

 On'rocks in streams: British Columbia. 



594. Hypnum purum" L. Stems 8-15 cm., depressed or ascending, 

 simply pinnate or with pinnate branches, delicate, julaceous; tufts large, 

 soft, r often depressed, pale green: leaves imbricate, very concave, decurrent, 

 denticulate all around, plicate; stem leaves broad ovate, strongly con- 

 tracted at base, apex round with an erect or curved apiculus; branch leaves 

 narrower, oblong; cells of basal angles quadrate or rectangular, pale green, 

 forming] small auricles; middle cells linear flexuous; inner perichaetial 

 1 eaves lanceolate, long acuminate, costa: dioicous: capsule horizontal, ob- 

 long or sub-cylindric; lid conic, pointed; annulus double; teeth orange, seg- 

 ments wide open along keel. Husnot, Muse. Gall. 419. Miquelon Is. 



595. Hypnum strain ineum laxi folium C. Mull. No description of this 

 variety is at hand. Greenland. 



596. Hypnum stramineum compactum Milde. Tufts thick, stems 

 stronger and shorter, below (with leaves) yellow-brown: leaves shorter and 

 broader. Bryol. Siles. 370. 1869. Greenland. 



597. Hypnum stramineum exiguum Ren. Stems depressed, short, 

 very delicate, filiform: leaves distant, very small. Fl. Miq. 57. Miquelon 

 Island. 



598. Hypnum occidentale S. & L. Plants densely cespitose; tufts intri- 

 cate, depressed, bright green, sub-sericeous: stem much divided, filiform, 

 sub-repent; branches prostrate, strongly branched, branchlets filiform or 

 attenuate or thickish julaceous; leaves erect spreading when moist, imbri- 

 cate when dry, ovate or Ungulate, rather obtuse, concave, border denticu- 

 late above; costa thick, reaching middle; cells minute, oval -rhombic, alar 

 quadrate, smaller; perichaetial leaves erect from a sheathing base, upper 

 broadly ovate, uppermost lanceolate, obtusely short acuminate, reflexed: 

 dioicous: capsule oblong-ovate to oblong-cylindric, inclined, sub-cernuous, 

 exannulate, dilated below mouth when empty; seta smooth, scarcely 1 inch 

 long'sub-cygneous; peristome teeth broadly lamellose within, segments en- 

 tire, 'punctulate, cilia 2, shorter; lid long conic, acute, shortly oblique ros- 

 trate. Sull. Icon. Muse. Suppl. 105. pi. 81. 1874. Roots and base of 

 trees, Oregon. 



599. Hypnum scorpioides Miquelonense R. & C. Robust, submersed; 

 tufts black, apical leaves only golden yellow passing to red; stems 15-35 

 cm.: leaves of principal branches sub-imbricate, slightly secund, bluntly 

 acuminate; leaves of secondary branches rather crowded, erect, falciform 

 a nd flexuous at point, narrower, oblong, long and narrowly acuminate, 

 n eedle-pointed, sometimes toothed at apex; costa sometimes short bifur- 

 cate, sometimes single, feeble, reaching or surpassing middle; median 



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