. A revision of the North American Isotheciaceae and Brachythecia [microform]. Mosses; Mousses. 170 5- Brachythecium acutum (Mitt.) SuU. Icon. Muse. Siippl. 99. //. 75. 1874. Hypmim acutum Mitt. Joum. Linn. Soc. 8: 33. /. 6. BrachytheciuininammilligcruviYiAndh. Macoun, Cat. Can. PI. 6: 192. 1792. Gametophyte in wide thin glossy-green to yellowish-green mats ; stems prostrate, creeping or sometimes floating, 5-10 cm. long, irregularly divided, radiculose at base, branching irregularly pinnatifid; branches few, 5-10 mm. long, frequently fome- 'vt complanate-foliate, not radiculose; branch leaves
. A revision of the North American Isotheciaceae and Brachythecia [microform]. Mosses; Mousses. 170 5- Brachythecium acutum (Mitt.) SuU. Icon. Muse. Siippl. 99. //. 75. 1874. Hypmim acutum Mitt. Joum. Linn. Soc. 8: 33. /. 6. BrachytheciuininammilligcruviYiAndh. Macoun, Cat. Can. PI. 6: 192. 1792. Gametophyte in wide thin glossy-green to yellowish-green mats ; stems prostrate, creeping or sometimes floating, 5-10 cm. long, irregularly divided, radiculose at base, branching irregularly pinnatifid; branches few, 5-10 mm. long, frequently fome- 'vt complanate-foliate, not radiculose; branch leaves distan lanceolate to ovate-lanceolate, gradually narrowed from just above the base, ending in a very slender point, X mm., distantly serrate or entire, very slightly concave, little or not at all plicate ; costa extending two-thirds the length of the leaf; median cells linear-vermicular, 10: i ; basal and alar cells shorter and broader, oblong-rhomboidal to quadrate ; stem leaves slender panted, triangular-ovate, nearly entire, '^y i "crvca. : monoi- cous, sometimes polygamous ; perigonial leaves ovate-acuminate, bordered by a row of elongated cells : perichaetium mm. long ; the inner leaves ovate-lanceolate, sheathing at base, open above, abruptly long-filiform acuminate, ecostate. Sporophytc cm. high ; seta .smooth, red-brown, often lighter colored above ; capsule red-brown, cblong-ovoid to short cylindric, 3 mm. long, 3:1, arcuate and inclined, occasionally nearly symmetric ; oper- culum long conic, apiculate ; annulus simple, of i or 2 rows of cells ; teeth of peristome subulate-lanceolate, orange ; segments nearly as long as teeth; cilia 2 or 3, well developed, strongly- nodose or appendiculate; spores minutely roughened, 13-15/i, maturing in autumn. Type seen, from Pack River, British Columbia (Lyall) in Mitten herbarium. On the ground and rotting logs and in moist and swampy places. Northern United States and Canada, across the conti
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