. A revision of the North American Isotheciaceae and Brachythecia [microform]. Mosses; Mousses. 168 Gametophytc in wide loose glossy yellow-green mats ; stems 5 cm. or more long, decumbent or ascending, often stoloniferous at the ends, subpinnately branching; branches 5-10 mm. long; branch leaves equally spreading to somewhat falcate-secund, lanceolate to ovate-lanceolate, mm. long-acumi- nate, strongly serrate above, concave, costate to the middle or beyond; median cells linear-vermicular 10-12:1; basal cells shorter and broader; alar quadrate ; stem leaves ovate-lanceolate, les
. A revision of the North American Isotheciaceae and Brachythecia [microform]. Mosses; Mousses. 168 Gametophytc in wide loose glossy yellow-green mats ; stems 5 cm. or more long, decumbent or ascending, often stoloniferous at the ends, subpinnately branching; branches 5-10 mm. long; branch leaves equally spreading to somewhat falcate-secund, lanceolate to ovate-lanceolate, mm. long-acumi- nate, strongly serrate above, concave, costate to the middle or beyond; median cells linear-vermicular 10-12:1; basal cells shorter and broader; alar quadrate ; stem leaves ovate-lanceolate, less strongly serrate, long subfiliform acuminate, 2 X — mm., strongly plicate: monoicous ; ftiale branches borne on the stem, gemmiform ; antheridia oblong-cylindric; paraphyses very long and numerous; perigonial leaves ovate, acuminate : perichaetium 2— n^n^- long; leaves sheathing at base, with squarrose points; inner leaves oblong-lanceolate, rather abruptly narrowed into a long filiform serrate acumination, costate. Sporophyte 1—2 cm. high ; seta red when young, red-brown when old, more or less roughened with rather low distinct papillae, nearly smooth below; cup^ule red-brown, mni-, 3: i, unsymmetric and inclined; operculum long-conic, apiculate ; annulus narrow, usually adher- ing to the operculum ; cilia i or 2, long, nodose and papillose- toughened ; spores roughened, i^fi, maturing in autumn. Type locality European. On damp earth and stones, in woods and in damp grassy places. Apparently the range of B. salcbrosiun. As yet no specimens have been reported from farther south than New Jersey. Quesnell, B. C. (Macoun). Illustrations.—Br. & Sch. 1. c.; Husnot, Muse. , gz. ExsiccATL—Aust. Muse. Appal. 314-315. Scarcely to be distinguished from B. salcbroswn except by the slightly scabrous seta, rather longer capsule and longer acuminate leaves. Th^re are all grades of roughness of seta and it is doubt- ful if this species is more than a
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