Ptychomitrium. MUSCI. ?,,S1 



toothed at top, costa ceasing below tlie apex : capsule brown, with short collum 

 and small mouth : teeth bifid nearly to the base, the unequal subulate divisions 

 connivent when dry. — Bruch &, iSchimp. 1. c, t. 262 ; Wilson, 1. c, t. 19 ; Berkeley, 

 Brit. Moss. t. 21, tig. 3. 



On o-ranite rooks above the Yosemlte Valley (Bolandcr) ; in the Alleghany Mountains, and 

 mountains of Eur<>iie. 



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

 loosely leaiy stems i or 5 inches long : leaves secund, erect, appressed when dry, 

 lanceolate tVom a broadly ovate semi-auriculate decurrent base, obtuse, usually irregu- 

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

 drical, with a short collum : teeth irregularly 3-parted or rarely bifid, the divisions 

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



Yosemlte Falls, Bolandcr. 



R. Nevii {Crrimmia Nevii, Muell. Flora, xxxi. 483, and Torr. Bot. Bulletin, v. 6) is found 

 at Portland, Oregon, Ncvius. Dark green or blackish, the stems somewhat naked below : upjier 

 branchlets incurved, leafy : leaves ajipressed-imbricate or slightly spreading, broadly ligulate, 

 obtuse, sparingly erose-denticulate at the apex, very concave, the inner perichittial nerveless : 

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



§ 3. Plants ivith more or less numerous short leafy lateral branchlets : leaves 

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

 calyptra and operculum as in % 2 : capsule erect : teeth divided into two 

 long narrowly lanceolate or filiform segments. ^^)5~KQ,om.im.m\ proper. 



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

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

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

 long Avhite denticulate point, deeply cariuate, minutely papillose throughout, the 

 entire margin recurved : capsule on a long purple pedicel, ovate-conical with a 

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

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

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



Shaded rocks near Paper Mill, Marin County, a variety with pellucid leaves, scarcely papillose, 

 and areolation narrower {Bolandcr) ; Mount llanier {Pickering) ; Vancouver Island {Lyall) ; 

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



R. HETEROSTicHUM, Brid., collected at Fort Colville {LyalT) and in Oregon {Ncvius), has 

 shorter stems (i to U inches long) sparingly branched, the elliptic- or obovate-cylindric capsule 

 smooth when dry and exceeding the operculum, and the short teeth unequally and irregularly 

 divided, incurved when dry. — Bruch & Schimp. 1. c, t. 265 ; Wilson, 1. c. Triclwstomum hctcro- 

 stichum, Hedw. Muse. Frond, ii, t. 25. Also in Colorado {Hall) and Alaska, and European. 



R. LANUGINOSUM, Brid., from Vancouver Island {Wood) and Mount Ranier (P(Hr/-/Hf/), has 

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

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

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

 Dan. XV, t. 2561, fig. 2. Trichostoiiium lanuginosum, Hedw. 1. c. iii, t. 2. In the White 

 Mountains and Europe. 



R. MiciiocARPrM, Brid. ; Oregon, Rail. Habit of E. canescens, the stems fascicled, with 

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

 and the areolation throughout elongated and sinuous : capsule small and thin, cylindrical, pale, 

 twice longer than the conic operculum. —Bruch & Schimp. 1. c, t. 268 ; Wilson, 1. c, t. 61. In 

 tlie White Mountains and the AUeghanies and in Europe. Growing in dry places and maturing 

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



24. PTYCHOMITRIUM, Bruch & Schimp. 



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



ranks, long-lanceolate, crisped, costate, the areolation at the apex minute and puncti- 



form, at base short-linear or rectangular ; pericha^tial leaves not distinct. Flowers 



monoecious, bud-like, the male terminal or axillary. Calyptra mitriform, reaching 



