(422) 
Dicranum Blyttt? B. & S. Rather common on rock 
about Lake Lindeman. Some specimens are dioicous, male 
plants occurring with three or four antheridial buds. The 
leaf-cells vary considerably in width below, with walls some- 
times thickened and pitted, especially in the perichaetial 
leaves a little above the base (533). 
Dicranum elongatum Schleich. Dawson. Very com- 
mon on both old stumps and rocks in damp places. Some 
of the specimens might be referred to var. orthocarpum if 
that is worth recognition as a variety (534). 
Dicranum fuscescens Turn. On rock along Dyea Creek 
and on earth at Lake Lindeman (536). 
Dicranum congestum Brid. On swampy ground at Daw- 
son. Distinguished from the preceding by the wider leaf 
point with cells elongated-oval, not short and angular above. 
In both species the cell walls are more or less porose and the 
nerve at base varies from } to + the width of leaf base (537). 
Dicranum Muhlenbeckit B. & S. Growing among bould- 
ers at Lake Lindeman. This has small, angular leaf-cells, 
often only .006 x .006 mm.—.006 x .oo8 mm. extending $ down 
the leaf or more. The cell walls may be more or less po- 
rose. The costa at base is about 4 width of leaf base (538). 
Dicranum fragilifolium Lindb. Very common on de- 
cayed logs about Dawson. Perichaetial leaves rather grad- 
ually narrowed to the subula with cell walls porose in lower 
part. Other leaves scarcely or not porose. The costa often 
well defined below and broad, over } width of leaf base (535). 
Dicranum angustum Lindb. Sterile specimens collected 
at Lake Lindeman in swamps and found in good fruit at 
Dawson in July. This isa more slender plant than scofa- 
rium with erect-spreading, nearly straight, smooth and en- 
tire leaves, giving a somewhat bristly appearance to the 
stems. The leaf-cells are elongated throughout often from 4 
to 8 times longer than wide in upper leaf, with walls strongly 
porose, at least below. Nerve indistinct and narrow a short 
distance above base. Perichaetial leaves abruptly narrowed 
to a smooth subula about } the length of blade. Capsule 
