A. W. Evans — Hawaiian Hepaticm of the Tribe Juhuloideae. 45 1 



compressed, with a short beak, antical surface plane, postical surface 

 with two shai'p keels in upper part, the keels (lateral and postical) 

 ending in subacute points or horns, cells in upper part of perianth 

 with more or less projecting walls especially on the keels, making the 

 latter appear slightly crenulate : ^ inflorescence terminal on a prin- 

 cipal branch or occupying a short lateral branch ; bracts in three to 

 eight pairs, slightly imbricated, subequally bilobed (at least near the 

 end of the spike) ; antheridia two in each axil. 



Stem CDS'"'" in diameter, leaf-lobes 0.5 x 0.35'^^'", lobules 0.15 x 0.1'^™, 

 cells at edge of lobe 17/x in diameter, in the middle 2\fx, at the base 

 23/A, lobe of bract 0.45x0.15"^'^, lobule 0.15x0.05™'^ perianth 

 0.5 X 0.35""". 



On leaves. Oahu : Nuuanu (Cooke). 



The specimens of this plant have so far been found only in com- 

 pany with G. ceatocarpa. It is smaller than this species and darker 

 in color, its leaves are shorter, and their lobules are much smaller 

 and more inconspicuous. The most striking differences, however, 

 are to be found in the perianths : in C. ovalifolia this organ is not 

 flattened and its four keels run out into four sharp horns ; in C ceato- 

 carpa, the perianth is much flattened and obcordate at the apex. 

 There is little danger of confusing the present plant with any of the 

 other Hawaiian species. 



5. Cololejeunea Hillebrandii (Aust.) Steph. 



Lejeunea longifolia Aust. Bull. Torr. Bot. Club, v, 17. 1874 (not 



Mitt.). 

 Lejeunea Hillebrandii Aust. Bot. Gazette, i, 35, 1876. 

 Cololejeunea Hillebrandii Steph. Bull, de I'Herb. Boissier, v, 842. 



1897. 



Plate LVIII., figs. 7-11. 



Dioicous : pale or whitish-green, closely creeping : stems irregularly 

 branched : leaves distant, the lobe widely spreading, ovate to lance- 

 olate, gradually narrowed into an acute, obtuse or rounded apex, 

 entire ; lobule ovate, inflated at least toward base, keel arched, free 

 margin appressed to lobe, curved toward base, bearing an obtuse 

 tooth at about the middle, obliquely lunulate beyond, and with a 

 small tooth in the middle of the lunation ; stylus a single cell, often 

 obsolete : leaf-cells more or less elongated, at least toward middle 

 and base of lobe, thin-walled aud without trigones : $ inflorescence 

 borne on a principal branch, innovating oti one side (or rarely on 

 both), the innovation once floriferous ; lobe of bracts similar to that 



