A. W. Evans — Hawaiian Hepaticoi of the Tribe Juhuloidem. 429 



9. DREPANOLEJEUNEA (Spruce) Schiflfn. 



Lejeunea subgenus Drepano-Lejeunea Spruce, Hep. Amaz. et And. 



183. 1884. 

 Drepanolejeunea Schiffn.; Engler & Prantl, Nat. Pflanzenfam. i% 



126. 1893. 



Plants small or minute, green to yellowish-green, creeping over 

 other bryophytes : stems sparingly branched : leaves distant or con- 

 tiguous, obliquely spreading or almost erect, the lobe acuminate or 

 acute and more or less decurved at apex, crenulate, spinulose or 

 laciniate on the margins; lobule ovate, inflated: underleaves dis- 

 tant, small, deeply bifid with subulate lobes : leaf -cells with thin 

 or slightly thickened walls, a few of them sometimes ocellate: ? inflo- 

 rescence terminal on a short branch, with a single innovation on one 

 side ; bracts and bracteoles slightly modified ; perianth five-keeled, 

 the keels dilated into horizontally spreading toothed horns : 5 inflo- 

 rescence occupying a sharp branch or terminal on a longer branch, 



Drepanolejeunea and Harpalejeunea are very closely related genera, 

 but the leaves of the first are oblique or erect-spreading and 

 usually so strongly decurved at the apex that they give the plants a 

 peculiar appearance, enabling us at once to recognize them. The 

 most essential difference between the genera is to be found in the 

 underleaves : in Drepanolejeunea these are small and bifid to or be- 

 yond the middle and their divisions are subulate and sharp-pointed 

 and usually widely divaricate ; in Harpalejeunea the underleaves are 

 larger and less deeply bifid, never beyond the middle, and their 

 divisions are broad and blunt-pointed or, more commonly, rounded 

 at the apex. There are also differences in the floral organs, partic- 

 ularly in the perianths. 



1. Drepanolejeunea Anderssonii (Angstr.). 



Lejeunea Anderssonii Angstr. Ofversigt af Kongl. Vetensk. Akad. 



Furband. xxix, Haft. 4, 24. 1872. 

 Harpalejeunea Anderssonii Steph. Bull, de I'Herb. Boissier, v, 142. 



1897. 



Plate LI., figs. 1-9. 



Autoicous : plants closely appressed to matrix, yellowish-green : 

 stems irregularly branched : leaves distant or contiguous, the lobe 

 erect-spreading, ovate from a narrow base, acute, entire or with one 

 or two small blunt teeth on antical margin ; lobule ovate, inflated 

 along keel and near base, keel strongly arched, forming an almost 



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



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