30 C. M. Cooke, Jr.—The Hawaiian Hepatice 
Odontoschisma gracile (Mitt.) Steph. 
Sphagnecetis gracilis Mitt.; Seemann, Flora Vitiensis, 405, 1871. 
Odontoschisma gracile Steph., Bull. de l’Herb. Boissier, v, 843, 1897. 
PLATE X; FIGURES 1-9. 
Sterile: plant brown when dry: stems slender, prostrate, long, 
rarely branching, branches often attenuate, flagelliform, rarely gem- 
miparous; true flagella rarely present, borne at base of stems; rhi- 
zoids in scattered clusters on postical surface of stem: leaves obliquely 
inserted, plane or nearly so, slightly imbricated or approximate, 
broadly subrotund, antical base rounded, postical base sometimes 
very slightly decurrent: leaf-cells with thin walls, very large tr- 
gones and stellate cavities: underleaves rudimentary, distant, minute, 
composed of 2 to 4 cells, underleaves at the base of branches larger, 
subligulate, composed of 7 to 10 cells; cells small, walls slightly 
thickened, cavities round or oval. 
Stems 0.1™™ to 0.12™" in breadth; leaves 0.4™™x0.45™™; leaf-cells 
near apex 25ux27p, trigones 10p, cells near middle of base 45yx27p, 
trigones 13; underleaves at base of branches 0.09™"x0.045™™ to 
0.09™™x0,06™™, cells 24; cells of rudimentary underleaves 19. 
Hawaiian Islands (Gaudichaud). Known only from the type- 
material, a portion of which is preserved in the Kew herbarium. 
Odontoschisma gracile differs from O. subjulaceum in being 
longer and more slender; its leaves also are smaller and less imbri- 
cated, more spreading, broader in proportion to their length and 
with the postical margin much more curved ; the leaf-cells have 
much larger trigones, and those at the base are longer and with 
narrower and more stellate cavities. 
Odontoschisma Sandvicense (Angstr.) Evans. 
Sphagnecetis Sandvicensis Angstr., Ofver. af Kongl. Vet. Akad. Férhandl., 
xxix (No 4), 22, 1872. 
Odontoschisma Sandvicense Evans, Trans. Conn. Acad., viii, 256, 1892. 
PuatTe XI. 
Dioicous: plants green, rarely red, loosely cespitose: stems 
appressed, branching irregularly, apex ascending, obtuse, sometimes 
gemmiparous, rarely flagelliform ; flagella borne at base of stem or 
branches ; rhizoids borne in clusters on postical surface of stems or 
branches : leaves slightly concave, obliquely inserted, ovate-subquad- 
rate, apex subtruncate or rounded; verruculose, postical base slightly 
rounded, antical base not decurrent, leaves on attenuated gemmi- 
