Evans : Hepaticae of Puerto Rico 283 



sometimes conforming to the normal type and sometimes spherical ; 

 normal lobule strongly inflated, ovate in outline, 0.17 mm. long, 

 0.12 mm. wide, keel arched, slightly roughened from convex cells, 

 forming an obtuse angle with the postical margin of the lobe, free 

 margin of lobule straight or nearly so," apical tooth short and blunt, 

 somewhat curved, hyaline papilla in a scarcely evident depression; 

 spherical lobules 0.2 mm. long, apical tooth short and rounded, 

 papilla in a distinct depression ; utriculi often present, singly or in 

 a pair at the base of a branch, sometimes attaining a length of 0.5 

 mm.; cells of lobe averaging 14// at the margin, 22 ji in the middle 

 and 35 X 22 /-/ at the base, trigones large and often confluent, triradi- 

 ate and rounded at the ends of the rays, intermediate thickenings oc- 

 casional, oval to rotund in outline; ocelli often but not always 

 present, occurring singly or in a pair at the base of the lobe, aver- 

 ^S^^'^g 46 X 28 /^ not developed in the bracts : underleaves distant 

 to imbricated, plane or convex when s(^cn from below, varying in 

 shape from orbicular and rounded or even cuneate at the base to 

 broadly reniform and cordate at the base, 0.25-0.5 mm. long, c).2 5- 

 0.85 mm. wide, bifid one third to one half, the sinus narrow and usu- 

 ally acute, the divisions erect, triangular, acute to obtuse, margin en- 

 tire : inflorescence dioicous : female branch variable in length but 

 rarely very short, the flowers innovating on one or on both sides, 

 the innovations usually short and simple ; bracts complicate, ob- 

 liquely spreading, the lobes ovate and connate antically at the base, 

 0.85 mm. long, 0.5 mm. wide, apex rounded or apiculate, margin 

 entire or sparingly and irregularly toothed in the upper part, lobule 

 ovate to ovate-lanceolate, 0.6 mm. long, 0.2 mm. wide, rounded 

 to acuminate at the apex, margin usually entire but sometimes 

 with a {qw scattered teeth in the upper part ; bracteole connate 

 on both sides, broadly ovate to orbicular, about 0.6 mm. long, 

 bifid about one third with erect and acute lobes and a narrow 

 sinus, margin entire or with one or two scattered teeth on each 

 side; perianth immersed (except the horns), obovoid, 1. 1 mm. 

 long, 0.6 mm. wide, surface slightly roughened especially along 

 the keels, apex broad and with a short beak, horns about 0.25 

 mm. long, terete and gradually tapering to the acute or bluntly 

 pointed apex, smooth, the two postical horns erect or slightly 

 spreading, the two lateral suberect to widely spreading : cf 

 inflorescence occupying a short branch or terminal on a longer 

 branch, sometimes proliferating at the apex ; bracts mostly m 

 three to six pairs, imbricated, strongly inflated, shortly and sub- 

 equally bifid, the lobes bluntly pointed ; bracteoles present at base 

 of spike, orbicular, bifid; antheridia usually borne singly : mature 

 sporophyte not seen. (Plate 20, figures 1-18.) 



On bark of trees or on logs, rarely on rocks or on living leaves. 



