304 FRYE 
1. Leaves about 7-8 mm. long. 
2. Leaf-sheath to blade about as 1:3-4. 
3. Plants about 5 cm. tall or shorter. 
4. Capsule 4-5 mm. long. 
5. Width of capsule to length as 1:3-5. 
6. Stems simple or with few branches. 
72 Pedicel2—3.cm. alone: 
On soil and rocks.—Egg Island, Disenchantment Bay, Alaska; 
Stewart Island and Mt. Rainier, Washington; northern Europe. 
4. P. alpinum, typical. 
1. Leaves about 9-11 mm. long. 
2. Leaf-sheath to blades about as 1:3-5. 
3. Plants about ro cm. tall or shorter. 
4. Capsule 4-5 mm. long. 
5. Width of capsule to length as 1:2-3. 
6. Stem much branched. 
7. Pedicel 25-35 cm. long. 
4e. P. alpinum var. macounii® (Kindb.) C. & Ther. in Proc. Wash. 
Acad. Sci. 4, p. 323 (a@o2)- 
P. macounti Kindb., in Bull. Torr. Bot. Club, 16, p. 96 (1889). 
1. Leaves about 12-14 mm. long. 
2. Leaf-sheath to blade about as 1:3-5. 
3. Plants about 15 cm. tall or shorter. 
4. Capsule 5-6 mm. long. 
~ §. Width of capsule to length as 1:3-4. 
6. Stems simple, rarely branched. 
7.) pedicely7—7, coi lone: 
On soil.—From the Alaska Peninsula southward along the coast 
to Washington, and eastward across British Columbia to the Rocky 
Mountains. 
POLYTRICHUM Dill 
Name derived from poly = many, and tricho = hair; referring 
_ to the hairiness of the calyptra. 
Plants dioicous, loosely to densely caespitose. Stems rigid, from 
subterranean rhizomes, erect or nearly so, densely leafy, simple, 
rarely forked or much branched at the tip. 
Leaves erect when dry, from a sheath-like base, lanceolate to 
awl-shaped, more than 1 cell thick except at margins, sheath 1 cell 
73 Named after John Macoun, naturalist of the Canadian Geological Survey. 
