

Evans: New West Indian Lejeuneae 377 



tion is beset with greater difficulties. It should be noted, however 

 that the leaf-lobes in H. uncinata are less commonly reflexed than 

 in the new species, that their apical acuminations are longer and 

 more abrupt, that their margins are rather more distinctly crenulate, 

 that the leaf-cells have less distinct trigones, and that the lobule, 

 although strongly inflated, shows the free margin and apex clearly 

 without dissection. 



Two other related species are the Puerto Rico H. subacuta 

 Evans* and Lejeunea {Harpalejeunea) stricta Lindenb. & Gottsche,f 

 originally described from Mexican specimens but recently collected 

 by the writer at Mabess River, Jamaica. In H. subacuta the lobes 

 of the stem-leaves are rounded to subacute at the apex, in the 

 latter case being usually tipped with a single cell ; occasionally on 

 the leaves of small branches there may be two superimposed cells 

 at the apex, but this can hardly be regarded as a typical condition. 

 In L. stricta the lobes of the leaves are a little sharper than in H. 

 subacuta and often show two superimposed cells. In this species, 

 however, the bracteole is scarcely retuse, and the keels of the peri- 

 anth bear narrow, denticulate wings. 



Leiolejeunea gen. no v. 



plants small, neither pigmented nor glossy : stems prostrate, 

 sparingly branched : leaves contiguous to loosely imbricated, the 



obe squarrose, convex, obliquely spreading, ovate, gradually nar- 

 rowed toward apex; lobule ovate in outline, strongly inflated 

 al ong keel, apical tooth unicellular, sharp, hyaline papilla distal 

 and marginal, arising from the cell next the apical tooth ; cells of 

 'obe plane or slightly convex, with local thickenings of the walls : 



. erleaves distan t, broad at apex and showing two rounded divi- 

 sions separated by a shallow sinus : 9 branch without subfloral in- 



thT k" S ' b f acts mucn larger than the leaves, very unequally bifid, 

 b'fiH • being smaI1 and sometimes obsolete ; bracteole shortly 



tit ' P , er ' antl1 sn ghrly compressed, obovoid, distinctly beaked, des- 

 e Ue °' keels and smooth or nearly so on surface : tf inflor- 

 s f Ce " ce snor t, not proliferating ; bracts monandrous, imbricated, 

 flatH k nd sube( l uall y bifid with rounded divisions, strongly in- 

 spik ' teoles similar to the underleaves, limited to base of 



P 1 e. (Name from /sTo- smooth, and Lejeunea. in allusion to the 

 ^anth^without keels.) . 



Bull Torrey Club 90 1 547. >/.».//-/,. 1903. ~ 



T ^ L. & N . Syn. Hep. 756. 1847. 



