A. W. Evans — Hawaiian ITepaticm of the Tribe Juhuloidem. 443 



innovating on one side or not at all, the innovation sterile or once 

 floriferous ; bracts unequally bifid, the lobe narrow at the base, ovate 

 or obovate, rounded to subacute at the apex, entire or slightly cren- 

 ulate, lobule lanceolate to ovate, acute or obtuse ; bracteole free, 

 obovate from a narrow base, bifid one half with acute lobes and sinus, 

 entire or slightly crenulate ; perianth cuneiform, gradually narrowed 

 toward the base, broad and emarginate at the apex and with a short 

 beak, antical keel low, lateral and postical keels sharp, slightly 

 crenulate: 5 inflorescence borne on a short lateral branch, bracts in 

 three to five pairs, imbricated, subequally bifid with rounded, crenu- 

 late lobes ; bracteole at base of branch bifid about one half with 

 acute lobes and sinus, other bracteoles wanting : spores green, 

 oblong, with a rather thin, whitish, minutely tuberculate wall. 



Stems COY™"" in diameter, lobes of leaves 0.5 x O.SS'^™, lobules 

 0.14x0.12™™, underleaves 0.15 x 0.1'"™, cells at edge of lobe 17/x in 

 diameter, in the middle 26 x 20/x, at the base 31 x 23yu,, lobe of bract 

 0.55x0.3™™, lobule 0.45x0.1™™, bracteole 0.35x0.2™™, perianth 

 0.7 X 0.4™™, spores 12|u, in shortest diameter. 



On leaves and bark. Oahu : Nuuanu (Cooke); also collected by 

 Andersson. Hawaiian Islands (Gaudichaud). 



The peculiar shape of the perianth places this delicate little plant 

 in Dr. Spruce's section " Cardianthce,^'' which includes half a dozen 

 South American species. Among these, L. dryniophila comes very 

 close to L. Pacifica : it differs in its leaf-cells, which, although 

 equally thin- walled, have minute but distinct trigones ; and in the 

 shape of its perianth, which narrows more abruptly towai'ds the base. 



In a sterile condition, i. Pacifica is much like L. anisophylla, 

 resembling it in size, in color, and in the shape of its leaves. In L. 

 aniaophylla, however, the keel of the lobule forms an obtuse angle 

 with the postical margin of the lobe instead of an almost straight 

 line, and the leaf-cells have small trigones and intermediate thicken- 

 ings. In fertile plants, the very different perianths will at once 

 serve to separate the two species. 



14. MICROLEJEUNEA (Spruce) Jack & Steph. 



Lejeunea subgenus Micro- Lejeunea Spruce, Hep. Amaz. et And. 286. 



1884 (in part). 

 Eulejeunea subgenus Microlejeunea Schiffn.; Engler & Prantl, Nat. 



Pflanzenfam. i', 124. 1893. 

 Microlejeunea Jack & Steph. Bot. Centralbl, Ix, 11. 1894 (reprint). 



Plants very small, green or whitish-green, creeping over other bryo- 

 phytes or closely appressed to substratum and sometimes forming 



