Evans: REPORT ON THE HEPATICAE OF ALASKA 605 
spreading lobes, and in lacking the cordate dilations so marked 
on both lobes of typical leaves at the end of the keel. In one inflo- 
rescence studied particularly the antical lobe was ovate, and meas- 
ured 1.6X1.2mm. The apex was very bluntly pointed and the 
margin, throughout the greater part of its length, bore scattered, 
short, sharp teeth, each consisting usually of a single cell. The 
postical lobe was oblong-ovate and measured 2.81.5 mm. The 
apex was more rounded and the margin like that of the antical lobe. 
The perianth was obovate with a broad truncate mouth and 
measured 3 X1.8 mm. The mouth bore about fifty teeth, variously 
directed and irregularly scattered, each being one or two cells long. 
None of the inflorescences studied had been fertilized, so that the 
characteristics of the sporophyte are still unknown. 
In his original description, Miiller compares 5S. cordifolia with 
S. dentata and S. uliginosa. As emended above the plant is 
evidently much closer to S. wliginosa than to S. dentata, and shows 
further a marked resemblance to certain forms of S. paludosa 
K. Mill. The writer,in fact, would consider the var. papillosa 
of S. paludosa a synonym of S. cordifolia, as indicated above. 
In both S. uliginosa and S. paludosa the keels of the leaves are 
short and usually strongly arched, the lobes are more or less 
dilated just beyond the end of the keel, and both lobes are more 
or less decurrent at. the base, the decurrence sometimes being 
very strongly pronounced. In S. cordifolia the first two of these 
features are exhibited in a marked degree, but the third feature 
is sometimes less conspicuous and may be lacking altogether as 
Miiller’s description indicates. S. uliginosa is distinguished at 
once by the fact that the margins of the leaves are entire through- 
out, although the mouth of the perianth occasionally bears a few 
scattered teeth. .S. paludosa is distinguished by its paler color and 
more delicate texture, the walls of the leaf-cells being only slightly 
thickened, by its more distant leaves, by the entire margins of its 
antical lobes, and by the less marked denticulation of its postical 
lobes. 
57. SCAPANIA DENTATA Dumort. 
On wet rocks, often in running water. Aats Bay (906); 
Augustine Bay (540); Mitrofania Bay (Rigg 1231); Port San 
Antonio (603); Saltery Cove (323). See notes under S. cordifolia, 
where S. dentata is reported for the first time from Alaska. 
