134 
ALEXANDER W. EVANS 
2. Lejeunea cladogyna sp. no v. 
Pale or dull green, sometimes becoming yellowish or brownish 
with age, growing in loose mats: stems mostly 0.08-0.1 mm. in 
diameter, sparingly and irregularly pinnate, the branches widely 
spreading and sometimes subdivided, often with smaller leaves than 
the stem but not microphyllous : leaves contiguous to loosely imbri- 
cated, the lobe obliquely to widely spreading, plane or slightly convex, 
subfalcate, broadly ovate, when well developed about 0.45 mm. long 
and 0.4 mm. wide, dorsal margin sometimes arching partially across 
the axis, sometimes not, sometimes strongly outwardly curved from 
the base to the broad and rounded apex, sometimes straight or slightly 
incurved in the basal region, ventral margin slightly outwardly curved 
to straight, margin entire throughout; lobule when well developed 
inflated, broadly ovoid, 0.09-0.12 mm. long and 0.09 mm. wide, keel 
straight or slightly arched, roughened from projecting cells, forming a 
very broad angle with the ventral margin of lobe, free margin somewhat 
involute to beyond the apex, sinus oblique and very shallow, apical 
tooth a rounded, straight, slightly projecting cell with a hyaline papilla 
or its proximal side; lobule usually poorly developed and reduced to a 
minute basal fold ; cells of lobe averaging about 16 fx along the margin 
and 28 X 18 )u in the median and basal portions, thin-walled through- 
out or with minute and indistinct trigones and intermediate thicken- 
ings, cuticle smooth; ocelli none: underleaves distant, ovate to ovate- 
orbicular, about 0.15 mm. long and 0.12-0. 15 mm. wide, bifid about 
one half with an acute to lunulate sinus and erect, triangular, sub- 
acute lobes, margin entire: inflorescence autoicous: 9 inflorescence 
borne on a very short branch, with only one vegetative leaf and one 
bracteole in addition to the involucral leaves, innovating on one side, 
the innovation short and sterile (so far as observed) ; bracts obliquely 
spreading, the lobe oblong to obovate, when well developed about 
0.3 mm. long and 0.16 mm. wide, rounded at the apex, entire, lobule 
about 0.2 mm. long and 0.08 mm. wide, narrowly oblong, the free 
portion 0.06 mm. long or less, obtuse to rounded at the apex; bracteole 
somewhat connate on one or both sides, oblong, about 0.3 mm. long 
and 0.16 mm. wide, bifid about one fourth with a narrow sinus and 
erect, rounded or very obtuse lobes, margin otherwise entire; perianth 
long-exserted, narrowly obovoid, about 0.6 mm. long, and 0.3 mm. 
wide, truncate at the apex and with a short beak, narrowed toward 
the base, sharply five-keeled above the middle, the keels indistinctly 
crenulate or denticulate from projecting cells, surface otherwise smooth : 
cf inflorescence occupying a short branch, not proliferating; bracts in 
two or three pairs, closely imbricated, strongly inflated, shortly bifid 
with a strongly arched, crenulate keel, and blunt divisions; antheridia 
in pairs; bracteole usually single at the base of the inflorescence, 
minute, shortly bifid: mature capsule about 0.2 mm. in diameter, 
[Fig. 2.] 
