Evans: HEPATICAE OF PUERTO RICO 263 
Cololejeunea erigens Spruce, Hep. Spruceanae. 1892 (name only). 
Evans, Trans. Conn. Acad. 10: 450. 1900 
Cololejeunea scabriflora Gottsche in Stephani, Hedwigia 34: 251. 
1895. 
Pale green or bright green, growing in depressed mats: stems 
clinging closely to the substratum, 0.07 mm. in diameter, simple 
to copiously and irregularly branched, the branches widely spread- 
ing, usually with somewhat smaller leaves than the stem: leaves 
distant to loosely imbricated, the lobe widely spreading, somewhat 
falcate, oblong-ovate to oblong-obovate, very variable in size, 
reaching a maximum of perhaps 0.7 X 0.45 mm., broad and 
rounded at the apex, antical margin rounded near the base, arching 
partially or wholly across the axis, postical margin straight or 
slightly curved, continuous with the arched keel or showing a 
shallow indentation at the junction, whole margin (except at the 
very base) minutely and irregularly denticulate from projecting 
cells; lobule ovate, 0.25 mm. long and 0.15 mm. wide (on large 
leaves), inflated in basal region or throughout the greater part 
of its extent, plane in outer portion, apical tooth usually consisting 
of two cells in a row, the lower cell bearing the hyaline papilla on its 
inner surface, proximal tooth shorter and usually consisting of 
a single blunt or acute projecting cell, separated from the apical 
tooth by one cell only, sinus shallow, about three cells long; cells 
of lobe averaging 13u at the margin, 23 X 17min the middle and 
about 35 X 23u at the base, thin-walled or with minute trigones 
and occasional intermediate thickenings, cells in apical region and 
along margin (in a zone from one to six cells wide) sharply conical 
and slightly thickened at the apex, remaining cells plane or nearly 
so: inflorescence autoicous (with occasional male individuals): 
2 inflorescence sometimes borne on a leading branch but usually 
on a more or less abbreviated branch, in extreme cases bearing no 
upper part, the sharp lateral keels minutely denticulate from pro- 
jecting cells, surface otherwise smooth or nearly so: & inflores- 
