Evans : Hepaticae of Puerto Rico 163 



Olive-green, not glossy, scattered or growing in depressed 

 mats: stems 0.17 mm. in diameter, irregularly pinnate, the 

 branches widely spreading, occasionally microphyllous : leaves 

 densely imbricated, the lobe suberect and convolute when dry, 



widely spreading and squarrose when moist, more or less convex, 



1 



broadly ovate, slightly falcate, 1-1.2 mm. long, 0.85-0.95 mm. 

 wide, arching partially or wholly across axis, rounded at base, 

 rounded to very obtuse at the apex, margin entire, strongly out- 

 wardly curved from the antical base to the apex ; lobule ovate, 

 0.6 mm. long, 0.35 mm. wide, the inflated portion occupying a 

 little more than the carinal half, keel arched, forming an obtuse or 

 rounded angle with the postical margin of lobe, free margin 

 straight or a little curved, often bearing a tooth one or two cells 

 ong in the vicinity of the apical tooth, the latter mostly two cells 

 long and one and two cells wide at the base, slightly outwardly 

 curved, hyaline papilla borne on a marginal cell but slightly dis- 

 placed to the inner surface of the lobule ; cells of lobe plane or 

 nearly so, averaging 1 5 // at the margin, 23 x 18 fi in the middle 

 and 35 x 18/* at the base, intermediate thickenings occasional, 

 oval or circular : underleaves loosely imbricated, plane or slightly 

 revolute at the apex, broadly orbicular-obovate, 0.6 mm. long, 

 0,75 mm. wide, cuneate toward base and attached by an arched 

 line, broad and truncate at the apex, margin entire or vaguely 

 angular-denticulate : inflorescence autoicous or polyoicous : 9 

 inflorescence borne on an ascending and more or less elongated 

 branch ; bracts widely spreading, complicate with a rounded keel 

 and shortly and unequally bifid, the lobe ovate, 1.6 mm long, 0.85 

 mm. wide, acute and apiculate, the apex usually tipped with a row 

 I of two or three cells, margin entire, lobule acuminate, otherwise 

 similar to the lobe, 1.4 mm. long, 0.4 mm. wide; bracteole free, 

 oblong or ovate, 1.4 mm. long, 0.85 mm. wide, undivided and 

 acute or shortly bidentate at the apex with sharp or blunt teeth, 

 margin otherwise entire; perianth about one third exserted, 

 obovoid, 1.5 mm. long, 0.85 mm. wide, slightly compressed and 

 cuneate toward the base, truncate to retuse at the apex, antical face 

 plane or nearly so, postical face with two confluent rounded keels 

 often extending beyond the beak : c? inflorescence terminating a 

 more or less elongated simple branch, not proliferating; bracts 

 mostly in eight to twelve pairs, shortly and unequally bifid with a 

 strongly arched keel, lobe obliquely spreading, more or less 

 squarrose, rounded, lobule suberect, mostly acute; antheridia 

 borne singly ; bracteoles extending the whole length of the spike, 

 similar to the underleaves but more often revolute at the apex : 

 capsule about 0.5 mm. in diameter, walls of inner layer of cells 

 thickened on the inside with a few large circular or oval pits ; 



