(132) 
slightly elongated at right angles to the opening and the 
leaves are rather larger and wider above with larger cells and 
leaf base narrower (679). 
Timmia megapolitana Hedw. Marsh Lake and Klondike 
River near mouth. This species seems to grow mostly on 
rather dry earth at the base of rock ledges, usually at a some- 
what higher elevation than the preceding. The capsule is 
nearly straight and furrowed when dry, the exothecal cells 
sinuous-walled and not elongated, the stomata oblong to 
roundish, up to .o72 mm. long and the leaf-base is usually 
wider than above (678). 
Timmia Austriaca Hedw. Caiion City, Dyea Creek and 
Moose Creek just below Dawson. This species has the leaf- 
cells somewhat angular above, as compared with the two 
preceding species and vein more or less toothed dorsally to- 
ward apex (680). 
Psilopilum arcticum Brid. Left bank of Klondike River 
just below Bonanza Creek. On damp black soil of hillside. 
Not fruiting (682). 
Pogonatum alpinum (L..) Roehl. Sheep Camp, Dyea 
Creek and Lake Lindeman (683). 
Polytrichum gracile Dicks. Yukon River just below White- 
horse Rapids (684). 
Polytrichum priliferum Schreb. Lake Lindeman (685). 
Polytrichum hyperboreum R.Br. Lake Lindeman. This 
plant has a white hair-point like the preceding, but grows up 
to 8 cm. high or more, with abundant branches. The hyaline 
lower cells average somewhat narrower and about twice 
longer than in pzlzferum. They are .0o8 to .o12 mm. wide 
and up to .160 mm. long (686). 
Polytrichum juniperinum Willd. Lake Lindeman (687). 
Polytrichum strictum Banks. Sheep Camp, Dyea Creek, 
and Lake Lindeman (688). 
Polytrichum commune L. Lake Lindeman and Dawson. 
At the latter place in fine fruit July 30 (689). 
PoLyTRICHUM INCONSTANS Hagen. 
Stems slender, up to 8 cm. high, rather uniformly leaved 
