558 Evans: HeEpaTICAE OF PUERTO RICO 
Heller (461). Utuado, Underwood & Griggs. El Yunque 
Evans (1). 
EUOSMOLEJEUNEA TRIFARIA (Nees) Schiffn.* 
Yellowish green, varying to bright green and often becoming 
brownish upon drying, growing in depressed mats: stems 0.I 
mm. in diameter, sparingly and irregularly branched, the branches 
obliquely to widely spreading : leaves loosely imbricated, the lobe 
widely spreading, usually convex and more or less revolute at the 
apex, broadly ovate-orbicular, falcate, 0.5 mm. long, 0.47 mm. 
wide, attached by an almost longitudinal line of insertion except 
for a very short distance at antical base, margin vaguely and 
irregularly crenulate from projecting cells, antical margin strongly 
curved from the base, arching in most cases considerably beyond 
axis, postical margin strongly curved and forming a distinct angle 
(usually of about 90°) with the keel, apex broad and rounded ; 
lobule triangular-ovoid, 0.15 mm. long, 0.09 mm. wide, strongly 
inflated but commonly constricted near orifice, keel straight or 
slightly curved, roughened from projecting cells, free margin 
strongly involute to beyond apex, then passing by a short lunulate 
sinus to end of keel, entire and almost straight when flattened out, 
apical tooth straight and continuous with inner part of free margin, 
short and bluntly pointed, normally appressed to the lobe and tak- 
ing part in the formation of the opening into the water-sac ; cells 
of lobe averaging 14 at edge of leaf, 22 » in the middle and 25 4 
at the base, more or less convex with a distinctly thickened outer 
wall, trigones large, triangular, with straight or slightly bulging 
sides, rarely confluent, intermediate thickenings very rare : under- 
leaves loosely imbricated, broadly orbicular, 0.5 mm. long, 0.6 
mm. wide, convex postically, shortly bifid — one fourth or less — 
with an acute to lunulate sinus and erect or slightly connivent 
divisions, obtuse to acute and often apiculate at the apex, tippe 
with a single cell or more rarely with two superimposed cells, dis- 
tinctly cordate at the base and attached by a strongly curved line 
of insertion, margin and cells as in leaf-lobes ; rhizoids commonly 
present, forming little tufts at the bases of the underleaves: 
inflorescence autoicous: @? inflorescence commonly borne on 4 
leading branch, more rarely on a short branch, innovating usually 
on only one side, the innovation commonly long and repeatedly 
* On account of its great variability and wide distribution, 4. ¢rifaria has many 
synonyms. A list of these was published by Stephani in 1888 ( Hedwigia, 27: 292); 
and the whole synonymy was afterwards given very fully by Schiffner (Conspect- Hepat. 
Arch. Indici, 263. 1898). It seems unnecessary, therefore, to enumerate the sy? 
onyms here. The species has been figured by Stephani, under the name Zejeune@ 
grandistipula ( Bol. Soc. Broteriana, 4: f/. 2, f. rg-2r. 1886). 
