28 Evans: HEpATICAE oF PUERTO RICO 
prostrate, 0.85 mm. in diameter, irregularly pinnate, the branches 
widely spreading, simple or sparingly subdivided, often with smaller 
leaves than the stem but not distinctly microphyllous : leaves con- 
tiguous to loosely imbricated, the lobe plane to slightly convex, 
widely spreading, somewhat falcate, ovate, 0.65 mm. long, 0.45 
mm. wide, antical margin arching partially across to a little beyond 
the axis, more or less outwardly curved from the base to the 
rounded or bluntly pointed apex, postical margin slightly curved, 
forming an obtuse angle with the keel, margin entire throughout 
or vaguely and irregularly sinuate ; lobule ovate in outline, 0.25 
mm. long, 0.15 mm. wide, the inflated portion less conspicuous 
than in LZ. Sagraeana, forming a flattened hemispherical swelling, 
rarely extending beyond the curved free margin, apical tooth 
rounded and often indistinct, sinus broad and shallow, adnate por- 
tion usually a single cell across; lobule often rudimentary ; cells 
of lobe plane or nearly so, averaging 10 4 at the margin, 21 4 in 
the middle and 32 x 21 y» at the base, middle lamella not distinct, 
trigones smaller than in ZL. Sagraeana, triradiate with pointed ends, 
intermediate thickenings numerous, oval, sometimes two or three 
between two trigones, pits distinct, rarely obliterated : underleaves 
distant to contiguous, reniform, 0.25 mm. long, 0.35 mm. wide, 
rounded at the base, broad and rounded to truncate at the apex, 
margin entire : inflorescence normally autoicous: Q branch more 
or less elongated ; bracts obliquely spreading, usually somewhat 
complicate but sometimes explanate, the lobe scarcely falcate, 
ovate, 0.9 mm. long, 0.55 mm. wide, antical margin a little more 
curved than the postical, apex varying from rounded to apiculate 
or subacute, margin irregularly angular-dentate or sinuate, the 
the apex ; lobule ligulate and often hardly distinguishable when 
explanate, 0.3 mm. long, 0.035 mm. wide, the free margin some- 
times merging gradually into the lobe, sometimes tipped with an 
acute apex ; bracteole free, orbicular, 0.75 mm. long, slightly 
sinuate in upper part but not distinctly toothed ; perianth one third 
to one half exserted, obovate in outline, 1 mm. long, 0.7 mm. wide 
without the laciniae (0.95 mm. wide including the laciniae), beak 
