24 Evans: HEPpATICAE OF PuERTO Rico 
pressed, the lateral keels being very sharp. The antical surface 
is commonly plane or slightly concave, but occasionally bears a 
short and low keel. On the postical surface there are two sharp 
keels, although it would be equally correct to regard these as the 
two angles of a single broad and low keel. Each of the four 
sharp keels gives rise to two interrupted wings, which are deeply 
laciniate. In certain species the laciniae are so numerous that 
they almost conceal the remainder of the perianth; in other species 
they are fewer and appear like scattered teeth or spines. Aside 
from the laciniae the surface of the perianth is commonly smooth, 
and the apex is broad, truncate and distinctly rostrate. 
The male inflorescence varies greatly in length, sometimes 
occupying a branch throughout its entire extent, sometimes being 
restricted to its terminal portion. The bracts are at first imbricated 
but afterwards tend to become more or less separated. They are 
subequally bifid and bear the antheridia in pairs. Bracteoles are 
to be found along the whole length of the spike. 
Although the genus has not before been reported from Puerto 
Rico, three species occur in the collections examined by the writer. 
One of these is the abundant and widely distributed Z. Sagracana 
(Mont.) Schiffn., which may be considered the type of the genus ; 
the second is referred to L. Muelleriana (Gottsche) Schiffn., the 
determination being based on the description given by Spruce and 
the specimens distributed in the Hepaticae Spruceanae ; the third 
is apparently undescribed. - All three species have been very spar- 
ingly collected on the island. 
LoPHOLEJEUNEA SAGRAEANA (Mont.) Schiffn.* 
Brownish or blackish-green, somewhat 
pressed mats: stems prostrate, 0.1 mm. 
pinnate, the branches widely spreading, simple or sometimes sub- 
divided, usually with smaller leaves than the stem but rarely mi- 
crophyllous : leaves loosely to closely imbricated, the lobe plane 
or somewhat convex, widely spreading, slightly falcate, oblong- 
ovate, 0.75 mm. long, 0.55 mm. wide, antical margin arching across 
or considerably beyond the axis, strongly outwardly curved to the 
broad and rounded apex, postical margin slightly curved, forming 
an obtuse angle with the keel, margin entire throughout ; lobule 
in diameter, irregularly 
* For a full Synonymy of this species, see Evans, Bull. Torrey Club 32: 1 
1905. a 
glossy, growing in de- | 
. 
