426 A. W. Evans — Haioailan Hepaticm of the Tribe Juhuloiclece. 



organ. Judging from the figure given by Sande-Lacoste,* a much 

 closer ally of the Hawaiian plant is the Javan Thysananthns 

 polymorphu8 (S.-L.) Schiffner,f particular!}' the variety lylanifolia. 

 Through the kindness of Professor Schiffner, I have been able to 

 examine an authentic specimen of this species from the Berlin Herba- 

 rium and find that it is considerably larger than T. elongatus, that 

 its leaves are commonly entire and more pointed and that their 

 lobules are different in shape, 



8. HARPALEJEUNEA (Spmce) Schiffn. 



Lejeunea subgenus Harpa-Lejeunea Spruce, Hep. Amaz. et And. 164. 



1884 (in great part). 

 Harpalejeunea Schiffn.; Engler & Prantl, Nat. Pflanzenfam. i', 126. 



1893. 

 Strep>sUejeunea Schiffn. 1. c. 127. 



Plants medium-sized to minute, pale green, varying to brownish- 

 or grayish-green, closely appressed to substratum, sometimes sub- 

 csespitose :, stems sparingly and irregularly pinnate: leaves c(mtig- 

 uous or slightly imbricated, widely spreading, somewhat decurved 

 and acute or acuminate at apex, entire, crenulate or subdentate on 

 margins, rarely incised-dentate ; lobule variable in size, inflated : 

 imderleaves distant, small to large, rotund to cuneate in outline, 

 bifid with blunt or subacute segments, rarely undivided : leaf -cells 

 small, sometimes a few of them ocellate : $ inflorescence borne on a 

 short branch, sometimes simple, sometimes innovating on one, or 

 more i-arely, on both sides ; bracts and bracteoles larger than the 

 leaves ; perianth pyriform to obovate, five-keeled, keels crenulate, 

 roughened or spinose : 5 spike occupying a short branch or terminal 

 on a longer branch, bracts few, antheridia one or two in each axil. 



The genus Strepsilejewiea^ first proposed by Spruce as a section of 

 his subgenus Harpa-Lejeunea, is recognized by Schiffner in a some- 

 what tentative way, and also by Stephani, It is certainly very close 

 indeed to Harpalejeunea. The most important differences enumerated 

 by Schiffner are the following : the larger size of the plants, their 

 darker color, the leaves toothed and reflexed at the apex, the dis- 

 tinctly thickened walls of their cells, the larger underleaves. These 

 differences do not appear to be very constant. I have therefore not 

 tried to separate the genera, but have referred to Harpalejeunea the 



* Syn. Hep. Jav. 58. vl. 11. 1856. 



t Conspect. Hepat. Arch. Ind. 305. 1898. 



