A. W. Evans — Hawaiian Hepaticm of the Tribe Juhuloidem. 445 



1. Microlejeunea albicans (Nees) Steph. 



Lejeunea cucuUata Auct. (not Jangermannia cucullata R. Bl, & 



Nees). 

 J^ejeunea cucullata y parasita G. L. & N. Nova Acta Acad. Leop.- 



Car. xix, suppl. 1, 473. 1843. 

 Lejeunea albicans Nees ; G. L. & N. Syn. Hep. 387. 1845. 

 Micro -Lejeunea albicans Steph. Hedwigia, xxix, 88. 1890; Jack & 



Steph. Bot. Centralbl. Ix, 10. 1894 (reprint). 



Plate LVI., figs. 1-5. 



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

 stratum, sometimes occurring in wide, thin mats : stems irregularly 

 pinnate: leaves distant to subimbricated, the lobe slightly spreading 

 or almost erect, ovate, reaching to about the middle of axis, rounded 

 at the apex, entire ; lobule strongly inflated, ovate, obliquely truncate 

 or excavate beyond the apiculate apex, the apical tooth composed of 

 one or two cells, keel strongly arched, crenulate, free margin strongly 

 involute as far as apical tooth : underleaves distant, orbicular, bifid 

 about one half with obtuse or subacute lobes and narrow sinus : leaf- 

 cells papillose, pretty uniformly thickened and without distinct 

 trigones : $ inflorescence borne on a short lateral branch or on a 

 principal branch, innovating on one or, rarely, on both sides, the 

 innovation usually floriferous ; bracts unequally bifid, the lobe obo- 

 vate, rounded at the apex, the lobule lanceolate and subacute, both 

 entire ; bracteole slightly connate on one side, obovate from a nar- 

 row, cuneate base, shortly bifid (about one tenth) with obtuse or sub- 

 acute lobes and acute sinus, entire or obscurely angular-unidentate 

 on sides ; perianth obovate, gradually narrowed toward base, trun- 

 cate above and with a short beak, antical keel low, the others sharp : 

 5 inflorescence occupying a short lateral branch, bracts in two to 

 five pairs, imbricated, subequally bifid with rounded lobes*; bracteole 

 at base of spike small, orbicular, bifid, the others wanting : spores 

 green, oblong, with a thick, white, minutely tuberculate wall. 



Stems 0.04"'" in diameter, lobes of leaves 0.25x0.15"'°', lobules 

 0.17x0.1^""^ underleaves 0.08 x 0.08"'", cells at edge of lobe 9/>i in 

 diameter, in the middle 12|U,, at the base 23xl2|U,, lobe of bract 

 0.35x0.2""', lobule 0.3x0.08'""", bracteole 0.4x0.25'"", perianth 

 0.6 X 0.35"", spores 25ju, in shortest diameter. 



On trees. Oahu : Nuuanu, Mt. Tantalus (Cooke); also collected 

 by Didrichsen and by Meyen. Kauai : Kilohana (Cooke). Hawaii 

 Kilauea (Didrichsen); also collected by Remy. 



Trans. Conn. Acad., Vol. X. March, 1900. 



30 



