Evans: HEPpPATICAE OF PuERTO Rico 547 
inally known from Mexico. Although closely related to Z. séricta, 
the Puerto Rico plant is now regarded by Stephani as specifically 
distinct, and it is described in the present paper as new. The sec- 
ond species studied is H. wncinata Steph., heretofore known from 
several other West Indian islands; the third is a rare epiphyllous 
species, which is apparently undescribed. 
A fourth species from Puerto Rico, Lejewnea patentissima 
Hampe & Gottsche,* is also referred to Harpalejeunea by Steph- 
ani~ and by Schiffner.t The original material of this species 
was collected by Schwanecke, and there seems to be no evidence 
of its having been found on the island a second time. The type- 
specimens are preserved ih the Gottsche herbarium at Berlin and | 
in the Hampe herbarium in the British Museum. Unfortunately 
these specimens are fragmentary and for the most part sterile. 
Even the vegetative organs, however, indicate that the plant is 
nota typical Harpalejeunea, but that it has much more in common 
with Ceratolejeunea, and the single preserved perianth shows con- 
clusively that the species should be referred to the latter genus. 
Lejeunea patentissima will not be included, therefore, among the 
species of Harpalejeunea, the descriptions of which immediately 
follow. 
Harpalejeunea subacuta sp. nov. 
Leeunea (Harpa-Lejeunea) stricta Steph. Hedwigia, 27: 291. 
1888. Not Lejeunea stricta Lindenb. & Gottsche; G. L. 
& N. Syn. Hep. 756. 1847. 
Pale or bright green, often becoming brownish upon drying, 
growing in depressed mats : stems 0.05 mm. in diameter, prostrate 
but rather loosely adherent to substratum, very sparingly branched, 
the branches widely spreading : leaves contiguous to slightly im- 
bricated, the lobes widely spreading, convex, often reflexed at the 
apex, falcate-ovate, 0.3 mm. long, 0.17 mm. wide, attached by an 
almost longitudinal line of insertion, gradually narrowed beyond 
lobule to apex, margin entire or nearly so, antical margin decur- 
rent by a single cell, strongly curved but rarely arching beyond 
axis, postical margin straight or slightly curved, apex varying 
from rounded to subacute, on leaves of small branches sometimes 
* Linnaea, 25: 355. 1852. 
t Hedwigia, 27: 288. 1888. 
f Bot. Jahrb. 23: 591. 1897. . 
