420 ^4, W. JiJvans — Hawaiian Hepaticce of the Tribe JuhuloidecB. 



squarrose when moist, tbe lobe ovate, arching across but not beyond 

 stem, scarcely rounded at the base, rounded at the apex, entire; lobule 

 (when explanate) ovate, strongly inflated its whole length, keel slightly 

 arched, not decurrent, appearing crenulate from its strongly pap- 

 illose cells, free margin appressed to lobe, denticulate with three or 

 four short blunt teeth : underleaves imbricated, reniform, slightly 

 cordate at base, entire or very slightly crenulate from projecting 

 cells : leaf-cells papillose with small and distinct trigones and inter- 

 mediate thickenings, rarely becoming confluent, marginal cells of lobe 

 short and squarish, forming a more or less distinct edge : ? inflores- 

 cence boi-ne on a principal branch, almost invariably with a single 

 innovation; outer bract (away from innovation) shortly bifid, lobe 

 broadly ovate or orbicular-ovate, rounded at apex, entire, lobule 

 ovate, rounded or very obtuse at the apex, entire ; inner bract (next 

 innovation) elobulate, broadly orbicular-ovate, rounded at apex, 

 entire ; bracteole orbicular, free, truncate at apex, entire or faintly 

 crenulate from projecting cells; perianth not compressed, truncate 

 and slightly retuse at apex, with a short beak, deeply eight- to ten- 

 plicate, keels slightly crenulate from papillose cells : $> spike not 

 seen : spores oblong, greenish, with a thick yellowish wall, densely 

 and minutely tuberculate and with scattered circular patches of I'adi- 

 ating plate-like thickenings. 



Stems O.S'"'" in diameter, lobes of leaves 1 x 0.8"'™, lobules 

 0.4x0.25'"", underleaves 0.4x0.6™"', cells at edge of lobe 18/i, in 

 diameter, in the middle SO/a, at the base 41 x 30/a, lobe of outer bract 

 l.Sxl.P"", lobule 0.7x0.5"^'", inner bract 1.35x1.45""", bracteole 

 1.2xl.l"'"\ perianth 1.3-1.5""" long, 0.8-0.9™'" wide, spores 40|u, in 

 shortest diameter. 



On rocks and trees. Oahu : near Diamond Point (Didrichsen); 

 Nuuanu, Luakaha (Cooke); also collected by Andersson. Kauai: 

 Kilohana, Kipu, Lihue, Half Way Bridge (Cooke). West Maui 

 (Baldwin). Hawaiian Islands (Hillebrand, Mann and Brigham). 

 First collected on the Islands by Gaudichaud. 



As the long synonymy indicates, the generic position of this 

 abundant species has been a matter of considerable controversy. 

 The fact that the perianth innovates almost invariably on only one 

 side would seem to throw it out of the genus Brachiolejeunea. 

 Schiffner, however, in his description of B. Gottschei, states that a 

 double innovation, although extremely rare, is occasionally found. 

 The pluriplicate perianth and the lobules of the leaves (with respect 

 to their shape and free margins) are quite characteristic of Brachio- 



