194 
Gametophyte in wide, loose mats, dark green, seldom whitish- 
green; stems irregularly divided, pinnately branching, decumbent 
or ascending, arcuate and rooting at the tips; branches 5-20 
mm. long, ascending and arcuate at the ends, more or less 
complanate-foliate ; middle branch leaves distant, spreading, ovate- 
lanceolate, 1.4—1.7 X 0.7—0.9 mm., narrowly acute to acuminate, 
with apex often twisted, somewhat decurrent, strongly serrate, not 
plicate or sulcate when moist ; costa extending beyond the middle ; 
median cells linear-fusiform, 13: 1; basal shorter and broader; 
a few of the alar cells rhomboidal to quadrate; stem leaves 
broadly ovate, broadly long-acuminate, less strongly serrate, more 
loosely areolate with a much larger area of rhomboid-quadrate 
cells at the base and alar angles: monoicous ; male branches 
frequent, gemmiform ; perigonial leaves ovate, acuminate, the outer 
with a well-defined costa: perichaetium 2.5 mm. long; leaves 
loosely sheathing with squarrose points; inner leaves oblong- 
lanceolate, gradually long and narrowly acuminate, costate, nearly 
entire; outer leaves shorter, ecostate. Sporophyte 2-2.5 cm. high ; 
seta red-brown, roughened with large distinct papillae ; capsule 
oblong-ovoid, dark red-brown, 2-2.5 mm. long, 14 as thick, 
strongly arcuate, horizontal, slightly narrowed under the mouth 
when dry ; operculum conic; annulus of about two rows of cells; 
segments a little shorter than the teeth ; cilia 2 or 3, appendiculate ; 
spores nearly smooth, about 14, maturing in winter. 
Type localities European. 
On decaying logs and stumps in moist mountain regions. 
Northern United States and Canada across the continent; Van- 
couver Island (Macoun); Montana (R. S. Williams); coals to 
New Jersey and Pennsylvania. d 
ILLUSTRATIONS.— Br. & Sch. 1. c. ; Husnot, Musc. Gall. p/. 94 +. 
Rab. Krypt., Fl. 4°. f. 368. 
Exsiccati.—Sull. & Lesq. Musc. Bor. Am. (Ed. 1). 125 
(Ed. 2) 504; Austin, Musc. Appal. 323. 
Fragmentary specimens of Hypnum n mee Mitt. (Journ. 
Linn. Soc. 8:32. 1865) of the type collection and from both the 
localities cited in the original description ze Dee examined and 
could not be differentiated from the ordinary American P. Starket. 
Specimens of JB. curtum  Lindb. identified by- Lindberg him- 
