380 IMUSCI. Grimmia. 



13. Gr. calyptrata, Hook. Densely tufted, canescent : leaves somewhat crowded, 

 erect and subaijpressed, oblong-lanceolate, somewhat folded-carinate, margin scarcely 

 recurved, the upper with a long smoothish hair ; pericha3tial leaves longer and 

 broader : capsule on a slightly exserted pedicel, cylindric-oblong, brown, wholly 

 covered by the calyptra : operculum conic-rostrate ; aunulus narrow : teeth purple, 

 bifid. — Drum. Muse. Am. n. 60, Guembelia calyptrata, jNIuell. Muse. Frond, i. 775. 



On dry ronks near Carson City ( Watson) ; in the Rocky Mountains from British America 

 {Drummond) to New Mexico. 



* * Calyptra cucullate, lobed at base: dloscioiis. 



14. G. elongata, Kaulf. Stems erect, very slender, naked at base, several 

 times branclied, fonuing tumid blackened tufts : leaves rather hrm, the lower 

 lanceolate and blunt, the upper lanceolate from an ovate-oblong base, the apex 

 hyaline or shortly setose, carinate-concave, the margin slightly thickened above : 

 calyptra oblique, long-beaked, 5-lobed : capside minute, exserted, elliptic, yellowish, 

 with short obtuse operculum and narrow annulus : teeth subentire, reflexed on 

 drying. — Bruch & Scliimp. 1. c, t. 259. 



In the Yosemite Valley {Br. B. W. James) ; aljiine regions of Europe. 



* % * Calyptra cucullate, entire : dicecious. 



15. Gr. montana, Bruch & Schimp. Very much like G. ovata, but less rigid, 

 the leaves a little broader and tipped with a longer roughish hair ; calyptra long- 

 beaked, reaching below the middle of the scarcely exserted capsule ; annulus nearly 

 wanting ; operculum long-beaked, usually deciduous with the calyptra. — Bryol. 

 Eur. t. 250 ; Sulliv. «& Lesq. Muse. Am.-Bor. Exsicc. 2 ed. n. 215. 



Near San Francisco, on Monte Diablo, and on Mono Pass at 7,000 to 8,000 feet altitude {Bolan- 

 clcr) ; in mountains, Nevada ( Watson) ; Western Europe. 



23. RHACOMITRIUM, Bridel. 

 Taller perennials, broadly cespitose, usually upon rocks, dichotomously branched. 

 Leaves very densely crowded, subequal, long-lanceolate, blunt or setosely tipped, 

 channelled with recurved margins ; basal areolation linear and sinuous. Flowers 

 dicecious. Calyptra conic-mitriform, lobed at base, with a straight dark more or 

 less roughened beak. Capsule oblong-cylindric, on a rarely curved pedicel, with a 

 narrow beaked operculum and broad compound annulus. Peristome elongated, 

 upon a short basal membrane, purple, the teeth irregularly 2 - 3-cleft at least to the 

 middle, or to the base with subequal filiform divisions, erect or nearly so when dry. 



A genus variously limited, of 30 or 40 species, many antarctic ; often included in Grimmia. 

 § 1. Regularly dlchotomous: leaves hhmt ; areolation minute and rounded, at 

 base linear and very sinuo%ts ; costa narrowly 2-ivi7if/ed on the back : 

 pjedicel arcuate : op)erculum conic-7'ostrate : teeth bifid nearly to the base. 



— Campylodryptodon. 



R. PATENS, Schimp. Stems 2 to 4 inches long, naked helovv : leaves spreading : pedicel rather 

 short : capsule pale brown, oval, furrowed when dry. — Syn. Muse. 2 ed. 272. Grimmia patens, 

 Bruch & Schimp. Bryol. Eur. t. 246 ; Wilson, Bryol. Brit. t. 19. Between Fort Colville and 

 the Rocky Mountains, Washington Territory, Drummond, Lyall. 



§2. JDichotomoiis, fastir/iately branched: leaves blunt; apical areolation quad- 

 rctte or oval, the basal very narrow and sinuous : capsule erect : beak of 

 calyptra rouyh^of opercxdum acictdar: teeth bifid to or below the middle. 



— Dkyptodox. 



1. R. aciculare, Bridel. Loosely cespitose, dark green, 1 to 3 inches higli : 

 leaves secund or spreading, widely lanceolate or ovate-oblong, obtuse, entire or 



