210 WILLIAMS: THE GENUS DESMATODON 
the capsule, the cells near the base not elongate, those further up 
broadly oblong, in erect rows; calyptra smooth, cucullate, de- 
scending well below the rim of capsule; spores papillose, rather 
irregular, the larger 20-24u in diameter. [Fic. 1. 
TYPE LOCALITY: Sweden or Lapland. 
DIsTRIBUTION: Greenland; Gaspé coast of Canada to Una- 
laska and southward to California and New Mexico. 
ExsIccATAE: Aust. Musci App. 123. 
ILLUSTRATION: Sull. Ic. Musc. Suppl. 23. 
The var. glacialis Schimp. is evidently not distinct from the 
var. muticus Brid. 
2. DESMATODON SUBERECTUS (Hook.) Limpr. in Rab. 
Krypt.-Fl. 41: 651. 1889 
Tortula suberecta Hook. in Drummond, Musci Am. 145. 1828. 
Desmatodon obliquus B.S.G. Bryol. Eur. (18-20): Desmatodon 10. 
1843. 
Paroicous, the antheridia usually four or five with few, nearly 
filiform and somewhat longer paraphyses, in a cluster just below 
the archegonia: plants in rather dull green tufts with branching 
stems, 0.5—I cm. high; leaves rather broadly ovate-lanceolate, the 
upper larger, 2-3 mm. long and I mm. wide, gradually tapering 
from below the middle to an acute apex and terminating in a 
nearly smooth awn usually less than 0.25 mm. long, the leaf mar- 
gins crenulate-papillose and mostly recurved: costa stout, e€x- 
current into the point, in cross-section mostly showing two large 
guide-cells, two rows of somewhat smaller cells on ventral side 
and on dorsal side a large stereid band with scarcely differentiated 
outer cells; cells in upper part of leaf from square to hexagonal, 
12-164 in diameter, usually obscure with numerous, minute, 
often C-shaped papillae on both sides, those of lower part smooth, 
pale, mostly rectangular; perichaetial leaves scarcely differen- 
tiated; seta up to 18 mm. long; capsule oblong-cylindric, mostly 
slightly curved and nodding, about 2 mm. long without lid, the 
stomata in two rows near the base; annulus of one or two rows of 
small, persistent cells; peristome teeth sixteen, usually divided to 
near the base into two or three slender, papillose forks, or some- 
times the forks more or less united, mostly twisted about half 
way round, from a basilar membrane extending well above the 
annulus and composed of very elongate cells with thick, project 
ing walls; lid high-conic, the cells just above the base elongate 11 — 
very oblique rows; calyptra extending about half way down the 
capsule; spores rough, up to about 224 in diameter. [FiG. 2. 
