154 
ILLusrRATIONS.—Hedw. l. c.; Sull. Icon. Musc. pl. 88; 
Grays Man. Ed. 2, p/. 5; Lesq. & James, Mosses of North 
America, A. 5 
Exsiccati.—Sull. Musc. Allegh. 34; Sull. & Lesq. Musc. 
Ber. Am. (Ed. 1) 256, (Ed. 2) 380; Macoun, Can. Musc. 262; 
Ren. & Card. Musc. Am. Sept. Exsic. 89. 
This species is easily distinguished by its curved branches, 
numerous quadrate alar cells and partially adherent segments. It 
varies a great deal in length of leaves and in length of leaf-cells, 
length and color of capsule and size of spores. Authentic speci- 
mens of Pylaisia Selwynit Kindb. show that it is merely a form of 
this species growing in exposed dry places. The plants are darker 
and the leaves more strongly recurved than usual. 
4. PYLAISIELLA VELUTINA (Schimp.) Kindb. Can. Rec. Sci. 1894: 
Zi 1o04. 
Pylaisia velutina Schimp. Bryol. Eur. fasc. 46—47. 1851. 
Gametophyte in wide glossy yellow-green mats; stems 5 cm. 
or more long, creeping; branches 5-10 mm. long, ascending, 
curved at tip; branch leaves loose, secund, especially when dry, 
ovate-lanceolate, o.8—1.2 by 0.3 mm., more or less long-acum- 
inate, entire or denticulate along the somewhat involute margin, 
concave, ecostate, or costa short, faint and double; median cells 
linear-fusiform, 8—10 : 1 ; quadrate alar cells few ; stem leaves much 
broader: antheridia stipitate, elongated-ovoid; inner perigonial 
leaves oblong-ovate to broadly ovate-lanceolate, acuminate : peri- 
chaetium 2 mm. long; leaves loosely erect, the inner oblong-lan- 
ceolate, long-acuminate, somewhat denticulate at apex ; leaf-cells 
linear above, linear-rhomboidal and porose below. Sporophyte 1.2 
—1.7 cm. high; seta brown; capsule brown, ovoid-cylindric, 2 
mm. long, 4:1 ; operculum conic, strongly apiculate to short-ros- 
trate; annulus narrow, of 2 rows of small cells; teeth of peri- 
stome yellow-brown, linear-lanceolate, very closely articulate, 
bordered the entire length by the adhering segments ; spores thick- 
walled, finely papillose, dark yellow brown, 24—30p, maturing in 
late summer or early autumn. 
Type locality American, (Sullivant). 
On bark of trees, old logs, etc.; New Brunswick, and Mt. 
Desert, Maine, south to North Carolina, west to Ohio and Indiana. 
