130  LEJEUNEAE OF THE UNITED STATES AND CANADA 
Lejeunea (Mastigo-Lejeunea) auriculata Spruce, Hep. Amaz. et 
And. 102. 1884. 
Mastigolejeunea auriculata Schiffn.; Engler € Prantl, Nat. 
Pflanzenfam. 1°: 129. 1893. 
Glaucous green, varying to brownish or purplish in older parts, 
growing in depressed tufts : stems prostrate or pendent, 0.15 mm. 
in diameter, arising from a creeping caudex, irregularly pinnate or 
on 2 plants rarely dichotomous, branches widely spreading, some- 
times small-leaved and flagelliform : rhizoids scanty : leaves densely 
imbricated, closely appressed when dry, widely spreading and sub- 
squarrose when moist, the lobe ovate-oblong, more or less falcate, 
mm. long, 0.5 mm. wide, apex usually obtuse, sometimes 
rounded or subacute, margin entire or subrepand, antical margin 
and shallow, passing very obliquely into postical margin of lobe, 
lobule on robust stems and branches often appearing simply as a 
mediate thickenings occasionally present toward base of lobe, cells 
at edge of lobe 8» in diameter, in the middle 21 x 12 p, at the base 
23 X 144: underleaves imbricated, broadly orbicular, o.5 mm. 
long, 0.55 mm. wide, with a broad, median ridge, truncate of 
slightly retuse at apex, cuneate toward base, indistinctly decurrent 
or minutely auriculate at base and attached by a slightly curved 
line of insertion, margin irregularly sinuate, more or less revolute 
at apex and near base : inflorescence autoicous or dioicous: 9 in- 
complicate, unequally bifid, the lobe ovate, suberect to widely 
spreading, 1.2 mm. long, 0.6 mm. wide, the apex usually subacute, 
but varying from rounded to acuminate, margin irregularly sinuous, 
lobule oblong to obovate, bluntly pointed, truncate or retuse at 
apex, 0.7 mm. long, 0.35 mm. wide; bracteole 0.8 mm. long, 0.7 
mm. wide, obovate from a slightly narrowed base, at the apex 
rounded, truncate 
line, about one third exserted, 1.5 mm. long, 0.6 mm. wide, rounded 
at base and at apex, beak short and broad, strongly compressed and 
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