A. W. JEJv cms— Hawaiian Jlepaticce of the Tribe Juhuloidem. 441 



distinct in its small, distant, and more deeply bifid underleaves, and 

 in its much smaller and differently shaped lobules. 



13. LEJEUNEA Libert. 



Xe/eM«ea Libert, Ann. Gen. des Sci. Phys. (Bruxelles) vi, 372. 1820 



(in part). 

 Lejeunea subgenus Eu-Lejeimea Spruce, Hep. Amaz. et And. 260. 



1884. 

 Eulejeunea subgenus Eiilejeunea sensu. str. Schiffn.; Engler & Prantl, 



Nat. Pflanzenfam. i', 122. 1893. 



Plants small or medium-sized, pale or brigbt green, sometimes 

 yellowish, adhering to substratum or forming thin mats : stems 

 irregularly pinnate : leaves contiguous or slightly imbricated, the 

 lobe widely spreading, ovate to obovate, rounded or obtuse at apex, 

 entire or slightly crenulate from projecting cells ; lobule small, 

 sometimes obsolete, inflated or plane: underleaves distant, small 

 or medium-sized, bifid : leaf-cells transparent, thin-walled, though 

 sometimes with small trigones : $ inflorescence borne on a prin- 

 cipal branch, innovating on one or on both sides ; bracts and brac- 

 teoles similar to the leaves and underleaves ; perianth with five sharp 

 keels, one antical, two lateral and two postical, not compressed : S 

 spike i;sually occupying a short lateral branch. 



Of the genus Lejeunea in its restricted sense, only two species, 

 X. anisopliylla and L. Pacijica, are definitely known from the 

 Hawaiian Islands. My determination of L. Pacijica is based on the 

 original description of Montague, supplemented by a drawing of the 

 type-specimen, which 1 owe to the kindness of Herr Stephani. The 

 specimens referred to L. anisophylla agree with a portion of the 

 type-material preserved in the Gottsche Herbarium at Berlin. 



1. Lejeunea anisophylla Mont. 



Lejeunea anisophylla Mont. Ann. des Sc. Nat. II, xix, 263. 1843. 



Plate LV., figs. 8-15. 



Autoicous : plants bright or pale green, closely appressed to sub- 

 stratum or growing in small thin mats : stems irregularly pinnate : 

 leaves imbricated, the lobe arching to or beyond the middle of the 

 axis, ovate, rounded or very obtuse at the apex, entire ; lobule ovate 

 from a broad base, obliquely truncate at the subacute apex, keel 

 slightly arched, free margin strongly involute almost to the apex : 



