THE POLYTRICHACEZ OF WESTERN NORTH AMERICA 325 
10. Polytrichum strictum Banks, in MSS. 
Polyirichum behringianum Kindb.,®° in Rev. Bryol. 1894, p. 39. 
Strictum = drawn tightly; probably referring to the closely ap- 
pressed leaves in the dry plant. 
Plants 6-20 cm. tall, densely tufted, rigid, almost terete when dry 
with its closely appressed leaves. Stems more slender than in P. 
juniperinum, usually covered for the greater part of its length 
with dirty-white tomentum, slightly branched. 
Leaves erect-patent, shorter and narrower than in P. Pee 
straight, closely and regularly imbricated when dry. Margin in- 
curved, entire. Lamelle 25-35, 4—7 cells high; marginal cells longer 
than wide, ovate or flask-shaped, smooth. Vein excurrent in a red 
dentate arista. 
Calyptra covering the capsule. 
Capsule sharply 4-angled, cubic or very little longer chen wide: 
hypophysis short. Pedicel 4-6 cm.long.—On soil——From Kotzebue 
Sound north of Bering Strait southward along the coast to British 
Columbia; Cascade and Rocky Mountains of British Columbia; 
northeastern North America; Greenland; Europe; Asia; Argen- 
tine Republic. 
11. Polytrichum hyperboreum R. Br., in Parry, Voy. Suppl. p. 
294, (1824). 
Polytrichum boreale Kindhb., in Laubm. Schwed. U. Norw. (1883). 
Name derived from hyper = beyond, and boreas = the north 
wind; referring to its arctic habitat. 7 
Plants dioicous, 3-12 cm. high. Stems simple or branched, 
branches in tufts. 
Leaves spreading when moist, appressed when dry. Margin 
broad, incurved, entire. Lamelle more or less crenulate, 5-7 cells 
high, 25-35; marginal cells ovate or flask-shaped, higher than wide, 
smooth, larger than the others. Vein excurrent in a Hes! thick, 
short, hyaline, slightly serrate arista. 
Capsule erect or inclined, sharply 4-angled, papillose, about 14 
times as long as wide; hypophysis flattened, deeply constricted from 
3° A comparison of authentic Polytrichum behringianum with Polytrichum strictum 
shows them to be the same. 
