192 
lanceolate, decurrent, 0.6-0.9 X 0.25—0.4 mm., gradually acumi- 
nate, serrate above, slightly concave; costa stout, extending into 
apex ; median cells oblong-rhomboidal to oblong-hexagonal, 3-5 : 
I; quadrate alar cells very numerous, extending up the sides of 
the leaf; stem leaves 0.8—1.2 X 0.5—0.8 mm., deltoid-ovate, long 
acuminate; acumination equaling !4 to % entire length of leaf: 
monoicous ; male branches abundant, borne on the stem ; anther- 
idia oblong; perigonial leaves ovate, acuminate, very loosely 
areolate : perichaetium 2 mm. long ; leaves sheathing at base with 
spreading tips; inner leaves oblong-ovate, long-acuminate, entire 
or serrate at apex, nearly ecostate. Sporophyte 10-15 mm. high; 
seta red-brown, very rough, twisted to the right below and usually 
to the left above; capsule red-brown to nearly black when old, 2 
mm. long, 2: I, ovoid, horizontal, not constricted under the 
mouth when dry; operculum conic, apiculate ; annulus of two 
rows of cells; cilia 2 or 3, stout, appendiculate; spores nearly 
smooth, 15—18y, maturing in autumn or early winter. 
Type locality European. 
On decaying logs, roots of trees and detritus of siliceous rocks. 
Mountains of northern United States and eastern Canada ; west 
to Lake Huron (Macoun) and Montana (R. S. Williams) ; Mary- 
land (J. D. Smith). 
ILLusTRATIONS.—Br. & Sch. 1. c. Husnot, Musc. Gall p/. 
94; Rab. Krypt. Fl. 4°: f. 373 
ExsiccATr.—Sull. & Dus Musc. Bor. Am. (Ed. 2) 503; 
Austin, Musc. Appal. 540; Macoun, Can. Musc. 286. 
Limpricht 1. c. states that the spores are papillose but I have 
been unable to find rough spores in either European or American 
material. Easily distinguished from the other American species 
by its filiform stems and branches and the areolation of the leaves 
i mers that of Amblystegium. 
er's type of Leskea laxifolia from the Northwest Coast 
(Menzies) has been seen and Dr. Best, Mrs. Britton and myself 
are agreed that it is this species. 
22. BRACHYTHECIUM GLACIALE Br. & Sch. Bryol. Eur. fasc. 
52-54. pl. 542. 1853. 
Gametophyte in loose glossy mats, yellow-green to brownish 
green; stems creeping or decumbent, subpinnately branching ; 
