216 Evans: HEpPATICAE OF PUERTO RICO 
nivent lobes and narrow sinus, margin slightly and irregularly 
crenulate or denticulate from projecting cells; perianth well ex- 
serted, broadly triangular in outline with nearly straight sides, 
0.75 mm. long, 0.55—-0.65 mm. wide, postical keel low and broad, 
apex slightly but distinctly emarginate with a very indistinct beak, 
lateral keels extended upward as rounded auricles, bearing above 
the middle two narrow and interrupted wings, sharply and irreg- 
ularly denticulate to laciniate on the margin, the teeth one to four 
cells long and one to three cells broad at the base, surface of 
perianth smooth or a little roughened from projecting cells, the 
postical keel sometimes more markedly scabrous in the upper 
part: J‘ inflorescence occupying a short branch ; bracts in two to 
six pairs : mature sporophyte not seen (PLATE IO, FIGURES 18-27). 
On roots of a tree fern. North slope of the Luquillo Moun- 
tains, Heller (4637). 
The perianth of P. innovata varies considerably in width and is 
sometimes quite a little broader than in the specimen figured. It 
is further remarkable for the distinct teeth which are often to be 
observed in the upper part of the postical keel ; in one case noted 
the keel was obscurely two-angled and the teeth were arranged 
along the angles. 
So far as is known at present this is the only species on the 
island in which subfloral innovations are developed. Its immediate 
allies, therefore, must be sought among species from other regions. 
Apparently the closest of these is Lejeunea (Priono-Lejeunea) mac- 
vocardia Spruce,* from the Peruvian Andes, in which the inflores- — 
cence is also autoicous. In this species, however, the leaves are 
blunter and are sometimes obtuse or even rounded, the marginal 
denticulations are less prominent, the underleaves are entire except 
for the apical sinus, the margins of the bracts are no more sharply 
toothed than in the leaves, and the perianth is more deeply and 
narrowly emarginate. No other described species seem to be very 
close. P. mucrodonta, P. subobscura Spruce + and P. validiuscula 
Spruce f have subfloral innovations and are also autoicous, but a 
three species are more robust than P. zznovata, their leaves are 
usually even blunter than in Z. macrocardia and their underleaves 
are also destitute of marginal teeth. These three plants were 
originally described from South American specimens, but P. cro- 
donta has been recorded from St. Vincent and P. validiuscula from 
Oe ae 
* Hep et And. 158. 1884. 
<eahask Mica. 52219, 1806. 
