444 A. W. Evans — Hawaiian Hepaticoi of the Tribe Jtihuloideoe. 



small flat mats : stems sparingly branched : leaves distant to subim- 

 bricated, the lobe slightly spreading or subparallel with stem, 

 rounded to subacute at apex, entire or slightly crenulate ; lobule 

 more than half the size of lobe, inflated : underleaves distant and 

 small, bifid : leaf-cells small, thick-walled : 9 inflorescence borne on 

 a principal branch or on a short lateral branch, innovating on one 

 or, rarely, on both sides ; bracts and bracteoles larger than the 

 leaves and underleaves, but similar ; perianth with five sharp, 

 smooth keels : ^ inflorescence occupying a short branch or terminal 

 on a longer one. 



The genus llicrolejeunea, as thus restricted by Jack & Stephani, 

 is represented on the Plawaiian Islands by a very common species, 

 which has been repeatedly referred to Lejeunea cucullata Nees. 

 Herr Stephani has pointed out, however, that this old species, as repre- 

 sented in the Lindenberg Herbarium, is composite and is made up of 

 no less than six perfectly distinct plants.* He at first advised that 

 the name '■' cumillata'''' be given up altogether, but has since restricted 

 it to a plant from Java, the original locality of the species,f and the 

 name is also used by Schiffner in a somewhat similar sense. J Stephani 

 refers the Hawaiian plant to Lejeunea albicans Nees, a species first 

 collected on the Philippine Islands. In the Gottsche Herbarium at 

 Berlin there is a specimen of this species from Manila, which closely 

 agrees with the Hawaiian plant, and the same is true of a specimen 

 from Luzon in the herbarium at Kew. There is also at Kew a plant 

 from Java, determined as Z. cucullata by Stephani, which is evi- 

 dently something quite distinct. The Hawaiian specimens in the 

 Gottsche Herbarium, finally, which are labeled L. cucullata are the 

 same as the common species and therefore agree with L. albicans 

 and not with the true L. cucullata^ as represented by this specimen 

 at Kew. In view of these facts, I feel justified in excluding L. 

 cucullata from the list of Hawaiian plants and in applying to their 

 common Microlejeiinea the name M. albicans. Herr Stephani§ has 

 recently ascribed a second species, M. erectifolia (Spruce) Steph. to 

 the Islands, but I have been unable to distinguish it. 



* Hedwigia, xxix, 89. 1890. 



I Jack & Steph. Bot. Centralbl. Ix, 10. 1894 (reprint). 



X Conspect. Hepat. Arch. Ind. 253. 1898. 



§ Bull, de I'Herb. Boissier, v, 842. 1897. 



