268 Evans: HEpATICAE OF PUERTO RICO 
keel and spreads almost at right angles to the axis, instead of 
obliquely as in L. planifolia. The apical tooth, moreover, is short 
and sharp and the distinct proximal tooth lies about midway be- 
tween the base and the outer end of the sinus. According to 
Gottsche the apical tooth consists of two or three cells ina row. 
On the evidence derived from this drawing and from the published 
descriptions L. marginata is clearly distinct from L. planifolia, 
and the comparison of specimens would probably show still other 
differences. 
In Leptocolea lanciloba (Steph.) comb. nov.,* a species known 
from the Nicobar and Hawaiian Islands, the Puerto Rico plant 
has another close ally. In L. lanciloba the hyaline margin is a 
little narrower than in L. planifolia and the lobule is still more 
aberrant. It consists of a slender lanceolate or subulate lamina, 
subparallel with the axis and gradually tapering to the apex. The 
latter is sometimes tipped with two cells side by side, sometimes by 
a single cell, and rarely by two superimposed cells. The hyaline 
papilla appears either at the apex or close to it on the proximal 
side of the lobule. A little below the middle the proximal tooth, 
‘one or two cells long, is situated. These peculiarities will at once 
distinguish L. lanciloba from L. planifolia and also from L. mar- 
ginata. Unfortunately, in the Hawaiian material at least, an 
occasional lobule is found which approaches in its structure the 
lobule of L. marginata. This condition awakens the suspicion 
that the remarkable lobule just described is inconstant in its 
characters and that L. lanciloba may perhaps be nothing more than 
an abnormal form of L. marginata or of some other species. The 
question is one, however, which cannot be answered from the 
material at hand. 
Leptocolea cardiocarpa (Mont.) 
Lejeunea cardiocarpa Mont. in Ramon de la Sagra, Hist. Fis. Pol. 
y Natur. Cuba 9: 476. pl. 18. f.4. 1845. 
Lejeunea (Colo-Lejeunea) cardiocarpa Spruce, Hep. Amaz. et And. 
300. 1884. 
Pale green, growing scattered or in depressed mats: stems 0.05 
mm. in diameter, irregularly branching, the branches widely 
spreading, similar to the stem: leaves imbricated, the lobe widely 
Ryoametsicn oe Steph. Hedwigia 34: 250. 1895. Evans, ‘Trans. Conn. 
Acad. 10: 452. 9. f. I-7. 0. 
