Vhjrhmmtnum. MUSCI. 381 



toothed uL t()|i, costa coasiii;^' below tlio npox : cai).siilo brown, witli short colhiin 

 and small iiioutli : teeth bitid nearly to the base, the uueiiual subulate divisions 

 eonnivent when dry. — Bruch k Schiinp. 1. c, t. 2G2 ; Wilson, 1. c, t. 19 ; Berkeley, 

 Brit. Moss. t. 21, lig. 3. 



On granite rocks above the Yoseinite Valley (Bolaiider) ; in the Alleghany Mountains, and 

 inoiintiiins of Euioiie. 



2. R. depressum, Lesij. Broadly cespitose, depressed, yellowish brown, the 

 loosely leafy stems 4 or 5 inches long : leaves secund, erect, appressed when dry, 

 lanceolate from a broadly ovate scmi-auriculate decurrent base, obtuse, usually irregu- 

 larly denticulate at the apex : capsule immersed upon a short pedicel, nearly cylin- 

 • hical, with a sliort collum : teetii irregularly 3-parted or rarely bifid, the divisions 

 distinct or more or less coherent. — Mem. Calif. Acad. i. 14. 



Yosoniite Falls, Bolandcr. 



R. Nevh (Orimmin iVcvii, Mnell. Flora, xxxi. 483, and Torr. Hot. Bulletin, v. 6) is found 

 at Portland, Oregon, Xcviits. Dark green or lilackish, the stems somewhat naked below: upper 

 branehlets incurved, leafy : leaves appressed-inibiieate or sliglitly spreading, broadly ligidate, 

 obtuse, sparingly erose-ilenticulate at the apex, very concave, the inner pericluttial nerveless: 

 cajisule oval on a very short curved pedicel : segments of the stout red teeth coherent. 



§3. riants with more or less numeroiis short leaf n lateral hranclilets : leaves 

 diaphanous at the apex {in our species) and setose-tipped: areolation, 

 eahjptra and opcrcnluni as in § 2 : cajisule erect : teeth divided into two 

 lomj narrowhj lanceolate or filiform segments. — Ruacomitriu.m proper. 



3. R. canescens, Bridel. Stems 2 to 4 inches long, erect, the many branches 

 more or less fascicled, yellowish green or hoary : leaves spreading and recurved, 

 the upper often secund, narrowly lanceolate from an oblong base, attenuate into a 

 long white denticulate point, deeply carinatc, miiuitely papillose throughout, the 

 entire margin recurved : capsule on a long ])urple pedicel, ovate-conical with a 

 narrow mouth, brown, obscurely striate when dry : operculum equalling or exceed- 

 ing the capsule : teeth very long, liliform, erect, deep purple. — Bruch & Schimp. 

 1. c, t. 270, 271 ; Wilson, 1. c, t. 19 ; Fl. Dan. xv, t. 2561, fig. 1. 



Shaded rocks near Paper iMill, Marin County, a variety with jKdlueid leaves, scarcely papillose, 

 and areolation narrower {Bolnndn-); Mount Hanier (Pickering); Vancouver Island (Lyall) ; 

 White Mountains, N. Hampshire ; throughout Europe. A variable species. 



}l. iir.TFJiosriciMTM, Brid., collected at Fort (.'olville {Lj/nll) and in Oregon (Nrvius), lias 

 shorter stems (i to 1;^ inches long) s])aringly branched, the elliptic- or obovate-cylindric capsule 

 smooth when dry and exceeding the oiierculinn, and the short teeth unequally and irregidarly 

 divided, incurved when dry. — Bruch & Schimp. 1. c, t. 205 ; Wilson, 1. c. Trirho'^lomum lictero- 

 slidnim, Jledw. ^lusc. Frond, ii, t. 25. Also in Colorado {Hall) and Alaska, and European. 



Pi. LANUr.iNOSUM, Brid., from Vancouver Island {Wood) and Mount 'Rwnuiv {rickcring), has 

 its stems much elongated (4 to 12 inches), slender, fnigile and nnudi branched, with crowded 

 linear-lanceolate dentate leaves : pedicels short, roughish : operculum as long as the small ovate 

 smooth capsule : teeth very long, filiform. — Bruch & Schimp. I. c, t. 269 ; Wilson, 1. c. ; Fl. 

 Dan. XV, t. 2.''>iil, tig. 2. Trichoslomum lanuginosum, Hedw. 1. c. iii, t. 2. In the White 

 ^lountains and Euioi)e. 



R. MiciiocAUPU.Nf, Brid. ; Oregon, Hall. Habit of A', cancscenx, the stems fascicled, with 

 numerous short branches : leaves crowded, recurved, lanceolate with a short white dentate point 

 and the areolation throughout elongated and sinuous : ca])sule small and thin, (cylindrical, pale, 

 twice longer than the conic operculum. — Brmdi k Schimp. 1. c, t. 208 ; Wilson,!, c, t. 61. In 

 the White Mountains and the Alleghanics and in Europe. Growing in dry places and maturing 

 its fruit in autumn, not in the spring as the preceding species. 



24. PTYCHOMITRIUM, Bruch k Schimp. 



Perennials, loosely cespitose on rocks or rarely trees. Leaves dull, in 5 to 8 



ranks, long-lanceolate, crisi)ed, costate, the areolation at the apex nn'uute and puncti- 



form, at base short-linear or rectangular ; i)ericha>tial leaves not distinct. Flowers 



monocci<Mis, bud-like, the male terminal or axillary. Calyptra mitriform, reaching 



