422 A. W. Evcms — Hawaiian HepatiGCB of the Tribe Jubidoidem. 



1. Marchesinia Mittenii sp. nov. 

 Plate XLVIIL, figs. 13-14. 



Dioicous : plants brownish-green : stems irregularlj'^ pinnately 

 branched : leaves slightly imbricated, the lobe ovate, horizontally 

 spreading, plane or slightly convex, arching over the stem and 

 rounded but scarcely cordate at base, rounded and usually apiculate 

 at the apex, entire or sparingly dentate near apex (with one to three 

 blunt teeth on each side of apical tooth); lobule slightly inflated, sub- 

 quadrate from a short base, keel strongly arched, not decurrent, 

 forming almost a right angle with postical margin of lobe, free 

 margin of lobule at first parallel with stem, then turning at a right 

 angle and passing into the postical margin of lobe, the two forming a 

 straight, continuous line, margin of lobule bearing about three blunt 

 teeth, the one farthest from the stem being the largest : underleaves 

 slightly imbricated, broadly obovate, reflexed at the broad, rounded 

 apex, gradually narrowed toward the decurrent and slightly cor- 

 date base and attached by a long, sharply curved line of insertion, 

 entire or very sparingly denticulate on reflexed margin : leaf-cells 

 with thick trigones and intermediate thickenings, occupying nearly 

 the whole of the wall : ? bracts deeply and unequally bifid, the 

 lobe obovate, rounded at the apex and sparingly dentate above the 

 middle, lobule ovate to lanceolate, acute, entire ; bracteole broadly 

 orbicular-obovate form a narrow base, rounded or truncate at apex, 

 sharply dentate, the teeth about twenty in number, mostly three to 

 six cells long and two to four cells wide at base ; underleaf next 

 bracteole sparingly dentate, but with shorter teeth : perianth and 

 S spike not seen. 



Stems 0.25"^™ in diameter, lobes of leaves 1.5 x 1°^"', lobules 

 0.25x0,3°"", underleaves 1.2x1.2'""', cells at edge of lobe 21|it in 

 diameter, in the middle 27/x,, and at the base 43 x35/x, lobe of bract 

 2 X 1.2'"'", lobule 0.5 x0.25'"'^\ bracteole 1.5 x 1.4'"'". 



Hawaiian Islands (Hillebrand), mixed with the type-specimens of 

 Lopholejeunea subnuda (Mitt.) Steph. 



The plant described above is known only fi'om the fragmentary 

 type-specimens without perianths in Mr. Mitten's herbarium, but it 

 undoubtedly belongs in this genus. It resembles very closely 3Iar- 

 chesinia robusta (Mitt.) Schifi^n. of tropical America, but this species 

 is amply distinct in having more densely imbricated leaves and spin- 

 ulose-denticulate underleaves. 



