1907] | Evans,— Notes on New England Hepaticae,— V ' 69 
The flattened stem with its distinct cortical layer, the bidentate 
leaves, the large leaf-cells with verruculose cuticle, and the minute 
underleaves with their sharp and unidentate divisions afford a com- 
bination of characters which will at once distinguish C. Sullivantu 
from all other known New England species. These peculiarities, 
however, are all shared by C. arguta, which, although European, 
has been reported from greenhouses in Philadelphia and is perhaps 
to be expected in similar localities elsewhere. C. arguta is distinguished 
mainly by the longer and more divergent teeth of its leaves, separated 
by a broader sinus. 
9. Calypogeia tenuis (Aust.) spec. nov. C. Trichomanis, var. 
tenuis Aust. Hep. Bor.-Amer. 74. 1873. Kantia Trichomanis, var. 
tenuis Underw.; A. Gray, Manual, Ed. 6, 713. 1890. In bogs. 
Closter, New Jersey (C. F. Austin). Woodbury, Connecticut (A. W. 
E.). The Woodbury specimens are in a somewhat better condition 
than those distributed by Austin and may be designated the type. 
Pale to bright green, growing scattered among Sphagna or forming 
loose tufts: stems varying from prostrate to ascending or erect, 0.15— 
0.25 mm. in diameter, cylindrical and composed of undifferentiated 
cells; vegetative branches few, mostly postical but occasionally lateral: 
leaves distant to loosely imbricated, slightly convex, spreading at an 
angle of about 60 degrees, arching partially across the axis, ovate, 
0.9-1.2 mm. long, 0.7-0.85 mm. wide, normally rounded and short- 
decurrent at base but often gradually long-decurrent in poorly devel- 
oped forms, margin entire or irregularly sinuate, apex rounded, obtuse 
or more or less bilobed (in very rare cases even trilobed), both lobes 
and sinus very variable; leaf-cells thin-walled throughout, averaging 
40 X 30 u at the margin of the leaf and 50 X 40 „u in median and 
basal regions, cuticle smooth: | underleaves distant, ovate or broadly 
ovate, 0.45-0.6 mm. long, 0.35-0.5 mm. wide, bifid to the middle or 
beyond with an obtuse sinus, divisions erect, triangular to subulate, 
acute to rounded at the apex, mostly six to nine cells long and four 
to six cells broad at the base, rarely bearing a blunt or sharp supple- 
mentary tooth on the outside: inflorescence (so far as known) dioicous: 
c^ inflorescence occupying a short branch or terminal on a somewhat 
longer microphyllous branch; bracts in three to six pairs, closely 
imbricated, deeply two- to four-lobed; bracteoles small, deeply bifid; 
antheridia single or in pairs: @ inflorescence not seen: gemmae oval, 
mostly bicellular, with a slightly thickened outer wall, borne in dense 
masses at the tips of microphyllous stems or branches. 
Although the present species is close to C. Trichomanis, agreeing 
with it in several important respects, it can be at once distinguished 
by its smaller size and more delicate habit, by its variable leaves 
