144 
Pterogonium repens Schwaegr. Suppl. 11: 100. pl. 27. 181r. 
Neckera repens Schwaegr. Suppl. 31: Sect. 2. pl. 246. 1828. 
Cylindrothecium repens De Not. Epil. 214. 1869. 
Gametophyte in rather thin intricate mats, varying from dark 
green to a lighter yellowish green ; stems 2—6 cm. long, prostrate ; 
branches short, cylindric, ascending, often slightly curved ; 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, 0.7-1.2 mm. long by 0.3-0.4 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: 1; 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 1.5 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, 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. l. c; Lesq. & 
James, Mosses of N. A. pl. 5.; Husnot, Musc. Gall pl $9.; 
Limpr. Rab. Krypt. Fl. 4?: A 353. 
ExsiccATi.—Drumm. Musc. Am. (S. States) 98 and Musc. 
Am. 159 (Neckera sericea). ` Sull. Musc. Allegh. 45; (Neckera 
sericea) ; SullL & Lesq. Musc. Bor. Am. (Ed. 1) 259, (Ed. 2) 
385; Austin, Musc. "scis 281; Ren. & Card. Musc. Am. Sept. 
Exsic. 235. - 
