. A revision of the North American Isotheciaceae and Brachythecia [microform]. Mosses; Mousses. iiEfliiiiiilliiJll! i â U : â â :!. 172 with spreading points, oblong-lanceolate, abruptly narrowed to a long filiform acumination, nearly entire or somewhat serrulate above, costa thin or wanting. Sporophyte cm. "high ; seta red-brown, smooth ; capsule red-brown, oblong-cylindric, suberect, slightly arcuate, somewhat contracted below the mouth when dry, the neck gradually narrowed to the seta, "^"i- lorig» about 4: I ("^5:rculum long conic to conic-rostrate; ann
. A revision of the North American Isotheciaceae and Brachythecia [microform]. Mosses; Mousses. iiEfliiiiiilliiJll! i â U : â â :!. 172 with spreading points, oblong-lanceolate, abruptly narrowed to a long filiform acumination, nearly entire or somewhat serrulate above, costa thin or wanting. Sporophyte cm. "high ; seta red-brown, smooth ; capsule red-brown, oblong-cylindric, suberect, slightly arcuate, somewhat contracted below the mouth when dry, the neck gradually narrowed to the seta, "^"i- lorig» about 4: I ("^5:rculum long conic to conic-rostrate; annulus none; teeth 01 ^ )me light red-brown, rather abruptly narrowed to a slender point; segments from a broad basal membrane, nearly as long as the teeth ; cilia two, strongly nodose or ap- pendiculate ; spores finely papillose-roughened, about 15/i, ma- turing in autumn or early winter. Type locality, Penn. (Ludwig). On earth rocks, and roots of trees in woods. Northeastern United States and eastern Canada; west to Minnesota, Kansas and Nebraska ; Colorado (Brandegee) ; south to North Carolina and Tennessee ; Missouri (Bush). Apparently common. ExsiccATi.âAs H. lacUwi Drumm. Muse. Am. (S. States), 122; Sull. & Lesq. Muse. Bor. Am. (Ed. i) 329, (Ed. 2) 488, 489, 490; Austin Muse. Appal. 309; Macoun, Can. Muse. 281, 566 {B. spurio-actiminatuui); Ren. & Card. Muse. Am. Sept. Exsic. 104, {B. bivcntrosuvi). Illustrations.âBr. & Sch. 1. c; Sull. Icon. */. 7/5; Husnot. Muse. Gall. pi. pj ; Rab. Krypt. Fl. 4^: /. Type specimens of both B. oxycladon and B. laetnm have been examined. The branch leaves of the former are less serrate than those of the latter but the acumination and serration of the leaves varies so much even on the same plant^ that these characters alone cannot be used even to separate varieties. The species is exceed- ingly variable and difficult to separate from its allies, especially /'. salebrosum , the difficulty is increased b
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