. A revision of the North American Isotheciaceae and Brachythecia [microform]. Mosses; Mousses. 135 ISOTHECIACEAE Spruce, Ann. and Mag. Nat. Hist. (II.) 3: 285. 1849. Gametophyte generally large, never minute. Primary stems creeping, radiculose. Paraphyllia lacking (except in Cliinacium). Leaves smooth, often plicate or concave ; median leaf-cells linear, alar cells quadrate (except in Holmgrenid). Sporophyte long ex- serted. Seta smooth, twisted. Calyptra cucullate. Operculum conic to conic-rostrate. Columella persistent. Capsule erect, straight, not conspicuously contracted under the mouth w
. A revision of the North American Isotheciaceae and Brachythecia [microform]. Mosses; Mousses. 135 ISOTHECIACEAE Spruce, Ann. and Mag. Nat. Hist. (II.) 3: 285. 1849. Gametophyte generally large, never minute. Primary stems creeping, radiculose. Paraphyllia lacking (except in Cliinacium). Leaves smooth, often plicate or concave ; median leaf-cells linear, alar cells quadrate (except in Holmgrenid). Sporophyte long ex- serted. Seta smooth, twisted. Calyptra cucullate. Operculum conic to conic-rostrate. Columella persistent. Capsule erect, straight, not conspicuously contracted under the mouth when dry. Peristome double, well developed; teeth lanceolate, articulate. Segments of endostome linear to lanceolate, attached to a narrow basal membrane, free, or adherent to the teeth in two species of Pylaisiella; cilia rudimentary or wanting. Spores roughened. Distinguished from the Brachytheciaceae by the straight erect capsule not contracted under the mouth when dry, absence of cilia and short basal membrane. Homalothecium and certain species of Brachythecium (notably B. acuminatum) have the capsule characters of this family, but their other characters show their relationship to be with the Brachytheciaceae. ' < Key to the Genera. Leaves costate, costa single, extending to the middle of the leaf or beyond. 4. Climacium. Leaves ecostate or the costa short and double. Alar cells not quadrate. . 3- Holmgrenia. Alar cells quadrate. Leaves complanate (except E. repetis and E. seductrix) ; annulus large, persistent (except E. Drummondii). I. Entodon. Leaves more or less falcate-secund especially at the tips of branches; annulus narrow. 2. I. ENTODON C. Muell. Linnaea, 18: 704. 1844. Also Bot. Zeit. 2 : 740. 1844. [Cylindrothecium Br. & Sch. Bryol. Eur. fasc. 46, 47. pi. Gametophyte growing in wide intricate mats. Stems densely leafy, creeping, subpinnately branching (stems erect and pinnate in E. orthocarpus); stem and branches more or less complanate-. Plea
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