Evans: HEpATICAE OF PUERTO RICO ait 
the same island and also from Dominica ; their discovery therefore 
may be expected in Puerto Rico. Judging from the description 
alone, another species from St. Vincent, Prionolejeunea vagans 
(Spruce) Schiffn.,* resembles P. zznovata rather closely in the 
form and denticulation of its leaves and also agrees with it in the 
possession of a subfloral innovation. It differs, however, in the 
more conspicuous trigones of its leaves, in its dioicous inflores- 
cence and in its indistinctly winged perianth, the wings being merely 
setulose or erose and never laciniate. 
There will be little difficulty in distinguishing P. iznovata from 
Cyclolejeunea angulistipa, although in both species the underleaves 
are commonly toothed on the sides. The Cyclolejeunca is more 
robust in all its parts, the cell-walls being firmer and their local 
thickenings much more pronounced, the leaves are blunt and 
usually ocellate, the inflorescence is dioicous, the female branch is 
variable in length and the wings of the perianth are narrower and 
more shortly denticulate. Of course the remarkable gemmae 
afford a further character of much importance and these can 
usually be demonstrated without difficulty. 
Prionolejeunea aequitexta sp. nov. 
Dull yellowish green, becoming brownish upon drying, loosely 
and intricately caespitose, often mixed with other hepatics: stems 
0.09 mm. in diameter, prostrate and loosely adherent to the sub- 
stratum, sparingly branched, the branches obliquely to widely 
Spreading : leaves contiguous to loosely imbricated, the lobe 
widely spreading, plane to convex, falcate, 0.5 mm. long, 0.4 mm. 
wide, outer part ovate-orbicular, dilated from a narrower basal 
region, antical margin straight or slightly incurved near base, then 
strongly outwardly curved to apex, postical margin also strongly 
outwardly curved, forming an angle of go° or less with the keel, 
apex broad, abruptly acute or apiculate, rarely reflexed, whole 
_ Margin (except close to the antical base and near keel) closely and 
often regularly denticulate or serrulate from projecting cells : 
lobule inflated throughout, ovoid, 0.17 mm. long, 0.1 mm. wide, 
keel strongly arched, free margin straight or nearly so, involute to 
yond apex, sinus lunulate, apical tooth rather sharp and slightly 
curved ; cells of lobe convex, averaging 15 at the margin, Ig y In 
€ middle and 30 x 19 at the base, rather thin-walled but with 
conspicuous trigones and intermediate thickenings : underleaves 
* Bot. Jahrb. 23: 590. 1897 (== Lejeunea vagans Sprace, Jour. Linn, Soc. Bot. 
39 339. 1894). ; 
