A. W. Evans — Hawaiian Hepaticm of the Tribe Juhuloidem. 453 



the apex, hyaline-margined except near the base, margin entire, almost 

 straight at postical base ; lobule plane, subulate from a narrow base, 

 acute or obtuse, bearing a short tooth below the middle of the inner 

 edge, otherwise entire or nearly so, keel short, straight, almost at 

 right angles with axis ; stylus a single cell, often obsolete: leaf-cells 

 with small trigones and occasional intermediate thickenings; hyaline 

 marginal cells in one or two rows at the apex, in one row elsewhere, 

 thin-walled : $ inflorescence borne on a short branch with smaller 

 leaves than the main axis, innovating on one side, the innovation 

 usually once or twice floriferous ; bracts very deeply and unequally 

 bifid, the lobe elliptical, rounded at the apex, entire, hyaline- 

 margined at and near the apex, lobule elliptical, rounded, truncate or 

 emarginate at the apex, entire or with a blunt tooth near the middle of 

 the inner edge ; perianth obovate, gradually narrowed toward base, 

 truncate and emarginate at the apex, and with a short broad beak, 

 plane on antical surface, and with a low postical keel, smooth : 

 t inflorescence terminating a branch ; bracts in five to ten or more 

 pairs, closely imbricated, lobe attached to lobule by an arched keel 

 about half as long as bract ; lobule inflated, with its free margin 

 strongly invohite ; antheridia two in the axil of each bract. 



Stem 0.07™'° in diameter, lobes of leaves (on robust axis) 

 0.95x0.65""", lobules 0.3x0.1"'"\ leaf-cells just within hyaline 

 margin of lobe 12/x in diameter, in the middle 15/a, at the base 

 32xl7;a, lobe of bract 0.7x0.3'"°^, lobule 0.35x0.15'"™, perianth 

 0.75x0.5™™. 



On leaves of Ear/enia Malaccensis. Kauai : Hanapepe River 

 (Heller). Oahu : Nuuanu (Cooke). 



Cololejeunea laticiloba. is the largest Hawaiian representative of 

 the genus. In common with C. longistylls, the lobes of its leaves are 

 hyaline-margined, but it is readily distinguished from that species 

 and from all the others known from the Islands, by its remarkable, 

 plane and narrow lobules. The species was first described from 

 specimens collected on the Nicobar Islands. 



7. Cololejeunea longistylis sp. nov. 

 Plate LIX., figs. 8-16. 



Sterile : pale green, closely appressed to substi'atum : stems irreg- 

 ularly branched : leaves imbricated, the lobe obliquely spreading, 

 ovate-oblong, rounded and hyaline-margined at the apex, entire, anti- 

 cal margin slightly curved, postical margin almost straight ; lobule 

 inflated, ovate, keel cordate at the base, then almost straight and con- 



