Evans: HEPATICAE OF PUERTO RICO 33 
the same size and agree in most of their leaf-characters, In 
L. lichenicola however no spiniform tooth is developed on the 
antical margin of the lobe. It differs from D. dzspinulosa also in 
its underleaves which are characterized by their larger size and 
more widely spreading divisions, resembling to a certain extent the 
underleaves of J. dissitifolta. 
Drepanolejeunea crucianella (Tayl.) 
Lejeunea crucianella Tayl. Lond. Jour. Bot. 5: 393. 1846. 
Lejeunea (Lepto-Lejeunea) cructanella Spruce, Hep. Amaz. et 
And. 197. 1884. 
Yellowish or brownish-green, growing in thin irregular patches, 
often in company with other Lejeuneae: stems 0.035 mm. in di- 
ameter, closely adherent to substratum, sparingly and irregularly 
pinnate, the branches widely spreading: leaves distant to contig- 
uous, the lobe obliquely spreading, plane or slightly concave, the 
antical margin being more or less reflexed, ovate to ovate-lance- 
olate, 0.3 mm. long, 0.1 mm. wide, slightly narrowed toward base 
and attached by an almost longitudinal line of insertion, margin 
sharply and irregularly toothed beyond lobule, the first postical 
tooth and the opposite antical tooth larger than the others, spini- 
form, measuring three to five cells in length and one to three cells 
in width at the base, the succeeding teeth one to four in number 
on each side, sometimes obsolete, each consisting of one or two 
cells, apex attenuate, ending in a row of three or four cells, often 
curved forward; lobule strongly inflated at base and along keel, 
often plane and appressed to lobe along free margin, broadly ovate, 
0.1 mm, long, 0.08 mm. wide, keel strongly arched, smooth or 
very slightly roughened in outer part from projecting cells, free 
Margin passing beyond apex by a lunulate sinus to the terminal 
cell of the adnate portion of the lobule, apical tooth curved ; cells 
of lobe plane or nearly so with slightly and irregularly thickened 
walls, averaging 18x14 ys; ocelli inconspicuous and sometimes 
obsolete, commonly two in each lobe, one near the base, the other 
near apex of lobule: underleaves distant, basal portion trapezoidal, 
0.035 mm, long, marginal cells six, divisions widely spreading (up 
to 0.1 mm.), each consisting of two or three cells in a single row: 
inflorescence dioicous : 9 inflorescence borne on a very short branch 
innovating on one side with a simple and sterile innovation ; bracts 
obliquely spreading, unequally bifid, the lobe ovate, 0.25 mm. long, 
0.13 mm. wide, margin irregularly spinose-dentate or ciliate, apex 
attenuate, lobule irregular in shape, 0.17 mm. long, 0.08 mm. 
wide, laciniate ; bracteole connate on one side near base, oblong, 
