220 Evans : HEPATICAE OF PUERTO RICO 
and less sharply pointed; the perianth, however, is essentially — 
the same. When compared with D. brachyclada, the dioicous 
inflorescence, the absence of t-shaped apical teeth on the lobules, 
the distinct local thickenings in the cell walls, and the blunter 
divisions of the underleaves will serve as distinguishing character- 
istics. 
DIPLASIOLEJEUNEA RUDOLPHIANA Steph. 
Lejeunea unidentata Mont. in Ramon de la Sagra, Hist. Fis. Pol. y 
Natur. Cuba 9: 478. pl. 19. f.2. 1845. Not Lehm. & Lindenb. 
Diplasiolejeunea Rudolphiana Steph. Hedwigia 35: 79. 1896. 
Yellowish or brownish green, growing in compact depressed 
tufts: stems 0.12 mm. in diameter, sparingly and irregularly 
pinnate, the branches widely spreading, similar to the stem but 
usually with smaller leaves: leaves imbricated, more or less convex, 
the lobe widely spreading, broadly ovate, 1.2-1.4 mm. long, 
I-1.2 mm. wide, antical margin rounded at the base, arching across 
the axis, strongly outwardly curved to the apex, postical margin 
likewise curved, forming a rounded indentation at the junction 
with the keel, margin entire or vaguely and sparingly crenulate 
from projecting cells; lobule obovate, 0.7 mm. long, 0.35 mm: 
wide, inflated in carinal region or throughout, keel arched, 
free margin involute near the base but usually plane elsewhere, 
apical tooth long and slender, subparallel with the axis or obliquely 
spreading, usually from six to eleven cells long and two ceHs 
wide at the base, proximal tooth shorter but sharp and distinct, 
often inflexed, usually tipped with a row of two or three cel S, 
hyaline papilla distal; cells of lobe averaging 15m at the margin 
28 X 22y in the middle, and 37 X 25y at the base, walls slightly 
thickened showing small trigones and very rare intermediate 
thickenings: underleaves distant to subimbricated, broadly 
cuneate, 0.17-0.2 mm. long in the middle, 0.4-0.6 mm. wid ze 
bifid about one half with a rounded sinus and obliquely spreading 
divisions, mostly rounded at the apex but occasionally obtuse of 
subacute, margin as in the leaves: inflorescence autoicous: ? 
florescence borne on an elongated branch or on a Very 
branch, the innovation usually simple and sterile; bracts obliquely 
spreading, strongly complicate and very narrowly winged along 
the keel, bifid two thirds to three fourths, the lobe oblong-obovat® 
0.4 mm. long, 0.17 mm. wide, rounded, margin vaguely cren™” 
from projecting cells, lobule oblong, 0.35 mm. long, 0.12 mm. wide, 
obtuse to subacute, margin as in the lobe; bracteole ovate, 0.35 
mm. long, 0.25 mm. wide, bifid one fifth to one third with acute 
