Evans: HEpPATICAE OF PUERTO RICO 23 
bracteole free or nearly so, oblong, 0.3 mm. long, 0.15 mm. wide, 
bifid about one half with subulate acute divisions, margin entire ; 
perianth obovoid, projecting somewhat beyond bracts, 0.6 mm. 
long, 0.35 mm. wide, narrowed toward base, truncate above and 
with a short beak, terete in lower part, sharply five-keeled above, 
the antical keel lower than the others and sometimes obsolete, keels 
rounded above or projecting as short horizontal obtuse or acute 
horns, more or less roughened or dentate at their extremities from 
projecting cells: ¢ inflorescence terminal ; bracts in several to many 
pairs, inflated, shortly bifid, the lobe obtuse and the lobule rounded, 
keel strongly arched, bordered in the outer part by a row of bulg- 
ing hyaline cells, bracteoles limited to base of spike, rudimen- 
tary ; antheridia in pairs: mature sporophyte unknown (//. z, /. 
I-9). 
On living leaves and on alog. El Yunque, Evans (23 p./., 89 
p-p-)- , 
The original specimens of this species from which the draw- 
ings were made were collected in 1900 on living leaves and show 
no signs of reproductive organs with the exception of propagula. 
They may be looked upon as the type of the species because in 
them the foliar characters are better developed than in the fertile 
material with perianths collected in 1902 ona log. In all of the 
specimens examined branches with rudimentary leaves are fre- 
quent, and many of these microphyllous branches, but by no means 
all of them, bear leafy propagula similar to those described for Lepto- 
lejeunea stenophylla and L. hamulata. The leaf-cells of D. diocel- 
/ata are very variable with respect to the local thickenings of their 
walls. In some cases the cells have fairly thin walls with small 
trigones, in other cases the walls show conspicuous trigones and 
intermediate thickenings, while in still other cases the thickenings 
are more or less confluent and give the walls the appearance of 
being irregularly thickened. It is sometimes possible to find 
these various conditions on a single plant. 
DREPANOLEJEUNEA SUBULATA Steph. 
? Leyeunea tenuis Hampe & Gottsche, Linnaea, 25: 356. 1852. 
Not Lejeunea tenuis (R. Bl. & N.) Nees. 
Drepanolejeunea subulata Steph. Hedwigia, 35:83. 1896. 
Pale yellowish-green, growing in loose thin mats or creeping 
among other prostrate hepatics : stems 0.05 mm. in diameter, pros- 
