. A revision of the North American Isotheciaceae and Brachythecia [microform]. Mosses; Mousses. Piero£^onium repens ScYiwdLCgr. Suppl. 1^: lOO. pl-zj. 1811. Neckera repens SchvfdiQgr. Suppl. 3': Sect. 2. //. 246. 1828. Cylindrothecium repens De Not. Epil. 214. 1869. Gametophyte in rather thin intricate mats, varying from dark green to a hghter yellowish green ; stems 2-6 cm. long, prostrate; branches short, cylindric, ascending, often slightly cur\'ed; ends of sterile branches often bearing numerous small gemmae in the axils of the leaves ; leaves oblong-ovate to oblong-lanceolate, closely imb
. A revision of the North American Isotheciaceae and Brachythecia [microform]. Mosses; Mousses. Piero£^onium repens ScYiwdLCgr. Suppl. 1^: lOO. pl-zj. 1811. Neckera repens SchvfdiQgr. Suppl. 3': Sect. 2. //. 246. 1828. Cylindrothecium repens De Not. Epil. 214. 1869. Gametophyte in rather thin intricate mats, varying from dark green to a hghter yellowish green ; stems 2-6 cm. long, prostrate; branches short, cylindric, ascending, often slightly cur\'ed; ends of sterile branches often bearing numerous small gemmae in the axils of the leaves ; leaves oblong-ovate to oblong-lanceolate, closely imbricate when dry, mm. long by mm, wide, acute to acuminate ; margins recurved and entire; costa lack- ing or short and double in robust plants; apical cells rhomboidal, median linear, 8 : i; quadrate alar cells numerous and extending up the margin of leaf; stem leaves larger and proportionally broader: dioicous; male branches not abundant; antheridia ob- long, large, stipitate ; perigonial leaves bordered by a row of narrow cells, short-oblong, concave, slightly narrowed at base: peri- chaetium i. 5 mm. long, sheathing below, spreading above ; inner leaves oblong, long acuminate, denticulate at apex, usually with a short thin double costa, upper cells linear, alar enlarged and rect- angular. Sporophyte 2-3 cm, high; seta brown ; capsule erect, about 3 mm. long, 4: i, brown; operculum conic-rostrate; an- nulus large, of three rows of cells; peristome 3—4 mm. long; teeth linear-lanceolate, hyaline-margined, orange, with raised lines at base; segments linear, usually free at base, nearly as long as teeth ; spores minutely roughened, 14/4, maturing in early autumn. Type locality, Switzerland. On bark of trees, decaying logs and stumps. Europe, and North America east of the Rocky Mountains. Common. Illustrations.—Schwaegr. 1. c; Br. & Sch. 1. c; Lesq. & James, Mosses of N. A. pi. 5.; Husnot, Muse. Gall //. <^p.; Limpr. Rab. Krypt. Fl. 4': /. 353. Exsic
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