, 
500 Evans: HEpaTICAE OF PUERTO RICO 
Lejeunea elliptica Lehm. & Lindenb.; G. L. & N. Syn. Hep. 
403. 1845. 
Colura elliptica Trevis, Mem. r. Ist. Lomb. III. 4: 402. 1877. 
Lejeunea (Lepto-Lejeunea) elliptica Spruce, Hep. Amaz. et And. 
194. 1884. 
Lepto-lejeunea elliptica Schiffn. Die nat. Pflanzenfam. 11°: 26. 
1893. 
Pale green, becoming brownish or blackish upon drying ; stems 
0.04. mm. in diameter, closely adherent to substratum, once to 
thrice pinnate with widely spreading branches: leaves distant, the 
lobe widely spreading, plane or nearly so when moist, appressed 
to substratum, oblong-ovate to oblong-lanceolate, 0.35 mm. long, 
0.18 mm. wide, attached by a very short oblique line of insertion, 
margin entire, antical margin not arching across axis, apex rounded, 
obtuse or rarely subacute; lobule ovate, inflated, 0.01 mm. long, 
0.08 mm. wide, keel slightly arched or almost straight, usually 
continuous with postical margin of lobe, roughened from project- 
ing cells, free margin plane and appressed to basal ocellus of lobe, 
bicrenulate at apex, then passing by a lunulate sinus to end of 
keel ; lobule often poorly developed ; leaf-cells thin-walled, plane 
or nearly so, averaging 13 in diameter at edge of lobe and 23/ 
in the middle and at the base, trigones and intermediate thicken- 
ings minute but distinct, never confluent ; ocelli 2 to 5 in number, 
arranged in a median, interrupted line, basal ocellus larger than 
_ the others, 45 » long, 25 » wide, projecting postically and forming 
a cylindrical water-sac with the plane lobule, sometimes partially 
overlapped by adjacent cells of lobe: underleaves distant with 
widely spreading, filiform divisions, each consisting of 2 oF 3 cells 
in a single row, the cells longer than in LZ. exoce//ata and with i 
bulging walls, basal portion broadly rectangular or trapezoidal, 
0.04 mm. long, 0.07 mm. wide, abruptly narrowed at the base, 
radicelliferous region surrounded by 6 marginal cells as in the 
preceding species but with the second marginal cells sharply ans” 
lar instead of rounded : inflorescence autoicous or dioicous : er 
florescence borne on a very short branch without innovation ; } 
and underleaf at base of branch similar to those of L. exocellala 
bracts obliquely spreading, scarcely complicate, shortly and une 
equally bifid, the lobe oblong to obovate, acute to rounded at the. 
