190 
growth. Distinguished by its long-conic operculum, percurrent 
costa and partially roughened seta. 
19a. BRACHYTHECIUM POPULEUM MAJUS Br. & Sch.l. c. pl. 536. f. 
Stouter glossy, nearly bronze-colored, densely foliate, leaves 
longer; habit of B. plumosum. 
On damp stones, Newfoundland (Waghorne). 
I9 b. BRACHYTHECIUM POPULEUM RUFESCENS Br. & Sch. l.c. ¢ 
Mats depressed, closely adhering to the substratum ; branches 
short, numerous, erect or ascending; stem leaves appressed, 
shorter and narrower, broadly lanceolate, bronze colored, seta 
shorter. 
On rocks, New Haven, Ct. (Pease). 
I9c. BRACHYTHECIUM POPULEUM OVATUM n. Var. 
Often having the appearance of var. rufescens, but with the 
stem leaves broadly cordate-ovate 1.4 by 0.8 mm., concave, mar- 
gins reflexed below, rather abruptly narrowed to a much shorter 
subulate acumination ; costa very stout, often ending below apex ; 
branch leaves ovate-lanceolate, median cells 5: 1 
On dry rocks in woods with Grimmia apocarpa. Johnson, Vt. 
(Grout); Peacham, Vt. (Dr. Blanchard); Indian Falls, Owen 
Sound (Macoun); New Harbor, Newfoundland, Jan. 30, 1891, 
(Rev. A. C. Waghorne). 
20. BRACHYTHECIUM DIGASTRUM C. Muell & Kindb. Macoun, 
| Cat. Can. Pl. 6: 190. 1892. 
Gametophyte in wide, olive-green mats, not glossy ; stems radi- 
culose, creeping and closely applied to the substratum, pinnately 
branching ; branches 5—10 mm. long, subjulaceous, terete-foliate ; 
branch leaves loosely appressed-imbricate when dry, erect-open 
when moist, ovate-to oblomg-ovate, acute to short acuminate with 
apex more or less twisted, o.8-1 mm. long and about 14 as broad, 
decurrent, bisulcate, very concave; margins reflexed below, serru- 
late; costa stout, extending 24-34 length of leaf; median cells 
fusiform-hexagonal, 5-7: 1; basal much shorter; quadrate alar 
cells numerous; stem leaves triangular-ovate, longer acuminate, 
