THE BRYOLOGIST 
Vol. XVIII September, 1915 No. 5 
NOTES ON NORTH AMERICAN HEPATICAE. VI 
Alexander W. Evans 
With Plate I 
Two of the species discussed in the present paper, one from Nova Scotia and 
the other from Florida, are proposed as new. Of the remaining eight species 
three represent additions to the hepatic flora of the United States, while the 
others are included to record extensions of range. The new species from Florida 
and one of the additions from the same state belong to the Leieuneae and in- 
crease the number of representatives of this group now known from Florida to 
thirty-five. 
1. Jamesoniella heterostipa sp. nov. 
Collected on July 6, 1910, at Barrington Passage, Cape Sable Island, Nova 
Scotia, on stones in a stream, by J. Macoun (No. 52). 
Growing in depressed and irregular mats, dark green, somewhat tinged with 
brown: stems about 2 cm. long and 0.6 mm. in diameter, very sparingly branched, 
the branches (so far as observed) of the Frullania type, essentially like the stem; 
rhizoids sometimes abundant, pale, not restricted to definite parts of the ventral 
region: leaves imbricated, more or less horizontal in position, but variously 
revolute and vaguely plicate, spreading at an angle of about ninety degrees, 
ovate-orbicular, the best developed mostly 1.5-2 mm. long and 1.4-1.9 mm. 
wide, attached by a long oblique line, shortly and narrowly decurrent at the 
dorsal base, rounded at the ventral base, somewhat narrowed toward the rounded, 
truncate, or (rarely) emarginate apex, entire; leaf-cells about 19 /z in diameter 
along the margin, 24^ in the middle, and 34/i at the base, isodiametric, thin- 
walled, but with small trigones having concave sides, cuticle smooth; under- 
leaves very variable, sometimes minute and evanescent, sometimes much larger 
and persistent, those of the latter type filiform to ovate, free or sometimes coales- 
cent on one side with a leaf, the apex long-acuminate to rounded, the margin 
entire; some of the largest underleaves attaining a length of 1.3 mm. and a width 
of 0.75 mm.: inflorescence probably dioicous: 9 inflorescence terminal on the 
stem or an elongated branch; bracts in about two pairs, outer bracts similar to 
the leaves, but a little larger (about 2.4 x 2 mm.), sometimes with a small basal 
lobe, innermost bract a little smaller (about 1.8 x 1.5 mm.) irregularly lobed 
and lacerate, with marginal teeth of various sizes; innermost bracteole (about 
2 x 0.9 mm.) deeply bifid with narrow acuminate lobes and irregularly toothed 
or lobed margins; perianth (very immature) deeply five-plicate with a large 
irregularly lobed mouth, the lobes acuminate with dentate to ciliate margins: 
remaining parts unknown. [Plate I.] 
The July number of The Bryologist was published September 21, 1915. 
