. A revision of the North American Isotheciaceae and Brachythecia [microform]. Mosses; Mousses. ii'''" m^, 7^y\^ i!^^^ ' â t â â â ,-â ">â .«â - â â -'M' W&B -ffr^SSr^' â ' i :' ,">?*... 186 and broader ; alar quadrate, indistinct: dioicous ; inner perichaetial Jeaves sheathing at base, more or less abruptly narrowed into a filiform reflexed acumination, dentate above, ecostate. Sporophyte 10-15 mm. high; seta red-brown, smooth; capsule red-brown, oblong, about mm. long and less than half as thick, erect and symmetric ; operculum conic, apiculate ; annulus lacking
. A revision of the North American Isotheciaceae and Brachythecia [microform]. Mosses; Mousses. ii'''" m^, 7^y\^ i!^^^ ' â t â â â ,-â ">â .«â - â â -'M' W&B -ffr^SSr^' â ' i :' ,">?*... 186 and broader ; alar quadrate, indistinct: dioicous ; inner perichaetial Jeaves sheathing at base, more or less abruptly narrowed into a filiform reflexed acumination, dentate above, ecostate. Sporophyte 10-15 mm. high; seta red-brown, smooth; capsule red-brown, oblong, about mm. long and less than half as thick, erect and symmetric ; operculum conic, apiculate ; annulus lacking ; segments of peristome attached to a narrow basal membrane, split between the articulations ; cilia single, rudimentary. Type specimen on trunks and roots of trees in woods near Baton Bouge, La. (Dr. Joor). (Type seen ; specimens examined by Mueller were communicated to the Columbia Herbarium by Dr. Mohr.) B. bivcntrosum is closely allied to B. acuminatum, from which it is distinguished by its smaller size and by its very narrowly pointed leaves with fewer and indistinct alar cells. 17. Brachythecium cyrtophvllum Kindb. Ottawa Nat. 4: 63. 1890. Gamctophyte caespitose; tufts glossy-green, usually densely intricate ; stems irregularly divided and branching ; branches fili- form, subjulaceous, 5-10 mm. long; branch leaves open-erect, appressed-imbricate when dry, ovate to ovate-lanceolate, acute or short acuminate, X mm., serrulate, very concave ; margins reflexed below; costa extending ^-^ length of leaf; median cells fusiform, 4-8: i; many basal c^Us shorter and broader; quadrate alar cells numerous ; stem leaves broadly ovate, acumi- nate, X mm. ; median leaf-cells 3-5 : i : dioicous. Sporo- phyte unknown. Type locality, Brighton, Northumberland Co., Ontario, October 6, 1888 (Macoun). Type seen. Roots of ttees and old logs. ' olleville, Ont. (Macoini); Waterloo, N. Y., Austin, 602 ; Hypnum {BvachythccUmi) sp. nov. (Ms. notes in Austin's he
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