musci. (mosses.) 637 



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



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

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

 mella. Capsule ovate, oval, or nearly cylindrical, with an erect and curved oi 

 (lexuous pedicel. Peristome single: teeth 16, lanceolate, cribrose, and 2-3-fid 

 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. G. leacoph&a, Grew Dioecious; stems 6" -10" high, compactly 

 csespitose ; 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-cIeft ; 

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

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



2. G. Olncyi, 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. 

 Olnej. — Approaches closely to G. trichophylla, 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. Pennsylvailica, Schwaegr. Dioecious; loosely caespitose ; stem 

 1' or more long ; leaves much as in No. 2, but dark green, 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. Donniaiia, 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, Schwcegr.) — White Mountains of New Hampshire, 

 Oakes. (Eu.) 



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



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

 acute 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, 



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