MUSCI. (MOSSES.) 637 



37. GRIiVOIIA, Ehrh. (Tab. 16.) 



Calyptra as in Scliistidium, but larger and extending below the mouth of the 

 capsule. Operculum conic-obtuse, or conic-rostrate, deciduous without the colu- 

 raella. Capsule ovate, oval, or nearly cylindrical, with an erect and curved 01 

 flexuous pedicel. Peristome single: teeth 16, lanceolate, cribrose, and 2-3-tid 

 above. Inflorescence monoecious or dioecious. Habit and mode of growth 

 strongly resembling Schistidium and Racomitrium. Habitat, on rocks. 

 (Named after Grimm, a German botanist.) 



1. O. leucopli&a, Grev. Dioecious; stems 6" -10" high, compactly 

 caespitose ; leaves widely spreading, ovate or ovate-oblong, concave, plane on 

 the margins, suddenly tapering into a very long pellucid dentate hair-point ; 

 capsule oval or oblong, erect, exserted ; teeth of the peristome deeply 2 - 3-cleft ; 

 annulus large, unrolling; operculum short or long conic-rostellate ; calyptra 

 mitriform, 5-lobed at the base. Sandstone rocks, S. Ohio. (Tab. 16.) (Eu.) 



2. G. Ollieyi, Sulliv. Dioecious; tufts loose, stems 5" -10" high, yel- 

 lowish-green, linear-lanceolate, gradually tapering into a long diaphanous ser- 

 rated hair-point; capsule oval or ovate-oval, not ribbed when dry, oblique or 

 horizontal on an exserted curved pedicel; teeth of the peristome perforated 

 above ; annulus compound ; operculum with a conic base and an oblique ros- 

 trum; calyptra cuculliform, 2-3-fid at the base. Rocks, Rhode Island, S. T. 

 Olney. Approaches closely to G. trichophy lla, Grev. ; but that is a rather more 

 slender plant ; its leaves longer and more flexuous, with a smooth hair-point ; 

 capsule regularly and strongly ribbed when dry, pendulous on a longer and more 

 curved pedicel ; teeth of the peristome bifid ; rostrum of the operculum straight ; 

 calyptra mitriform ; annulus larger. 



3. G. Pemisy I vaiiica, Schwaegr. Dioecious ; loosely caespitose ; stem 

 1' or more long ; leaves much as in No. 2, but dark gre'en, and with a stouter 

 costa ; capsule immersed, erect on a short pedicel, oval-oblong, smooth when 

 dry; operculum conic-rostellate; calyptra mitriform, lobed. On rocks, Alle- 

 ghany Mountains ; common : fruit rare. Larger than any of the preceding. 



4. G. I>Oilllifilia, Smith. Monoecious; tufts compact, small, hemi- 

 spherical, hoary; stems 3" -4" high; leaves linear-lanceolate, with a long and 

 rough hair-point, their margins plane ; capsule oval-oblong, shortly exserted on 

 an erect pedicel; annulus rather narrow; operculum conic-obtuse; calyptra mi- 

 triform, lobed. (G. obtusa, Schvxegr.) White Mountains of New Hampshire, 

 Oakes. (Eu.) 



38. COSCINODO1V, Spreng. (Tab. 18.) 



Capsule large, campanulate, plicate, crenate at the base. Operculum conic, 

 ncnte or shortly rostellate. Capsule obovate or oval-oblong, immersed, erect, 

 short-pedicellate, annulate. Peristome single: teeth 16, equidistant, lanceolate, 

 very much cribrose, reflexed when dry. Inflorescence monoecious or dioecious : 

 male flower gemmiform. Combines the characters of Orthotrichum and Grim- 

 mia ; the habit and structure of the foliage being that of the last-named genus 

 54 



