140 LEJEUNEAE OF THE UNITED STATES AND CANADA 
Yellowish-green, growing in depressed tufts: stems prostrate, 
loosely appressed to substratum, 0.1 mm. in diameter, sparingly 
and irregularly branched: rhizoids scanty: leaves loosely imbri- 
cated, the lobe convex, obliquely spreading, broadly ovate, 0.5 
mm. long, 0.4 mm. wide, rounded at the apex, margin entire or 
sparingly crenulate from projecting cells, antical margin arching 
across or just beyond axis, rounded at the base, postical margin 
forming an angle a little greater than a right angle with keel; 
lobule strongly inflated, triangular-ovate, 0.15 mm. long, 0.1 mm. 
wide, keel slightly arched, free margin strongly involute to beyond 
the subacute apex, then obliquely truncate or lunulate to end of keel; 
cells of lobe plane or convex, with somewhat thickened walls and 
large, triangular trigones, averaging 13 ¡1 in diameter at edge of lobe, 
18 # in the middle and 25 x 18 p at the base: underleaves con- 
tiguous or imbricated, orbicular, 0.35 mm. long, bifid about one 
third with obtuse or acute, erect or subcontiguous lobes separated 
by an obtuse or acute sinus, rounded or cordate at base and attached 
by a long, curved line of insertion, margins entire : inflorescence 
dioicous: 9 inflorescence borne on a short branch, innovating on 
one side with a short, simple innovation, very rarely without in- 
novation ; bracts complicate, unequally bifid, the lobe erect-spread- 
ing, unsymmetrically ovate, usually rounded at the apex, but 
varying to apiculate or acute, 0.6 mm. long, 0.35 mm. wide, lobule 
variable, mostly oblong and rounded at the apex, 0.17 mm. long, - 
0.07 mm. wide ; bracteole free, orbicular to oblong, 0.45 mm. long, 
0.4 mm. wide, bifid about one third with acute or subacute, erect 
lobes and narrow sinüs; perianth about half exserted, oblong-ob- 
ovoid, 0.9 mm. long, 0.45 mm. wide, gradually narrowed toward 
base, rounded at the apex and with a short beak, lateral keels 
sharp, postical keel about as long as perianth, broad and sharply 
two-angled, antical keel short, in upper part of perianth: 4 spike 
borne on a short branch, sometimes proliferating ; bracts and 
bracteoles similar to those of E. duriuscula, but the lobes of the 
bracts not crenulate at apex, 
` Type-locality, Surinam (Splitgerber). 
On rotten logs. Florida (J. D. Smith, Lighthipe, Underwood, 
Faxon) ; Alabama (Mohr). Widely distributed in tropical America. 
Exsıc.: Hep. Amer. 1 34 (as Lejeunea ( Euosmo- Lej.) trifaria). 
: The abundant specimens of E. opaca, collected by Underwood 
in Florida, were at first confused with Æ trifarta (Nees) Schiffn. 
This species 1s even more widely distributed, being found in the 
tropics of both hemispheres, and وز‎ certainly to be expected in the 
southern parts of Florida. It is a more robust plant than Æ. opaca, — 
