30 Evans: HeEpaTIcAE OF PuERTO RIco 
differential characters derived from the floral leaves and perianths. 
In L. Sagracana the bracts have widely spreading lobes, subrotund 
in outline and rounded at the apex, the bracteole is broader than 
long and plane or nearly so along the margin, the perianth is 
almost hidden by the bracts, except for the projecting laciniae, 
while the latter are densely crowded and usually broaden out from 
anarrow base. In Z. Mwelleriana the bracts have obliquely spread- 
ing lobes, ovate in outline and often distinctly narrowed toward 
the apex, the bracteole is orbicular and narrowly reflexed near the 
base, the perianth is more exserted, and the laciniae, which are 
much less numerous, usually taper from a broad base. In all 
probability the specimens from Brazil and Trinidad, which have 
been referred to Lejeunea Sagraeana y of the Synopsis, repre- 
sent a form of Z. Muelleriana, a fact to which Gottsche has already 
called attention. * 
Another close relative of ZL. Muelleriana is Lejeunea (Lopho- 
leyeunea) Mariei Besch. & Spruce, a species known at present from 
the island of Guadeloupe only, where it was collected in 18 77 by 
Ed. Marie. Through the kindness of Mr. Slater, the writer has 
been able to examine the type specimen of this species from the 
Spruce herbarium. It is about as large as L. Muelleriana, but its 
leaves are more strongly falcate and apparently always rounded at 
the apex. The lobule is rarely rudimentary and shows a some- 
what larger water-sac, which extends outward from the axis rather © 
than forward, very muchas in Lejeunea subfusca. Theadnate portion, © 
however, is only one or two cells across. Several of these dif- 
ferences are noted by Spruce, but one of the characters of Z. 
Mariei which he especially emphasizes, the dioicous inflorescence, 
seems to be inconstant, some of the plants included in the original 
material being clearly autoicous. The perianths of the two species 
are very similar, but the bracts of Z. Mariei are distinguished by 
being entire or only slightly denticulate, the lobule is commonly 
more distinct, and the bracteole is plane. 
Lopholejeunea Howei sp. nov. 
Dull olive-green, growing in depressed mats: stems prostrate, 
0.13 mm. in diameter, irregularly pinnate, the branches obliquely 
* Mex. Leverm. 183. 1863. 
fT Bull. Soc. Bot. de France 36: clxxix. 1889, 
