434 A. W. Evans — Hawaiian Hepaticcje of the Tribe Juhuloidem. 



age : stems irregularly pinnately branched : leaves more or less 

 imbricated, the lobe ovate, widely spreading, mostly obtuse or sub- 

 acute at apex, margin usually crenulate or serrulate from jDrojecting 

 cells, rarely dentate, lobule medium sized, inflated, rarely obsolete : 

 underleaves suborbicular, usually small, bifid to about the middle 

 with acute or obtuse lobes, entire on margin : leaf-cells with thick- 

 ened walls, more or less papillose, ocelli present in a few species near 

 base of lobe : $ inflorescence borne on a very short branch, without 

 innovations or with a single sterile innovation; bracts longer than 

 the leaves, bifid, subentire or usually crenulate ; bracteole free, 

 cuneate to oval, shortly bifid, entire or crenulate ; perianth clavate 

 or obovate, sharply five-keeled, the keels and sometimes the whole 

 surface roughened from projecting cells : 3 spike usually occupying 

 a short branch. 



1. Trachylejeunea Oahuensis sp. nov. 



Plate LII., figs. 3-12. 



Autoicous : creeping among other bryophytes, yellowish- or 

 brownish-green : stems irregularly branched : leaves contiguous or 

 subimbricated, the lobe widely spreading, falcate-ovate, convex, 

 arching to about middle of axis, rounded at apex, entire or slightly 

 crenulate from projecting cells ; lobule ovate, strongly inflated, 

 obliquely lunate at apex with a short apiculate tooth, keel strongly 

 arched, forming approximately a right angle with the postical 

 margin of lobe, free margin of lobule almost straight, strongly invo- 

 lute to beyond apical tooth, entire : underleaves distant, broadly 

 ovate, bifid about two fifths with obtuse lobes and narrow sinus,, 

 entire, not cordate at base: leaf -cells with conspicuous trigones, 

 papillose : ? inflorescence borne on a short branch, sometimes inno- 

 vating on one side, sometimes without innovation ; bracts unequally 

 bifid, the lobe obovate, sometimes broadly so, truncate or rounded 

 at apex, entire, lobule ovate to lanceolate, obtuse, entire ; bracteole 

 ovate, bifid about one sixth with obtuse lobes and narrow sinus ; 

 perianth obovate, truncate above and with a short beak, almost 

 terete to above middle, then sharply five-keeled, the keels crenulate : 

 3 spike occupying a short branch, bracts in two to five pairs, stronglj^ 

 concave, subequally bilobed with blunt divisions; bracteoles at 

 base of spike small, shortly bifid with obtuse lobes, upper bracteoles 

 wanting. 



Stems O.OV'"™ in diameter^ lobes of leaves 0.4x0.3'"™, lobules 

 0.2x0.1"^'", underleaves 0.17 x 0.1 S'""", cells at edge of lobe 13/a in 



