14 Evans : Hepaticae of Puerto Rico 



Rectolejeunea emarginuliflora (Gottsche) 



Lejeunea emarginuliflora Gottsche in Wright, Hep. Cubenses 

 (without description) ; Schiffner, Bot. Jahrb. 23 : 585. 1897 (as 

 synonym). 



Cheilolejeunea emarginuliflora Schiffn. /. c. 



Pale-green : stems scattered, 0.05 mm. in diameter, loosely 

 adherent to the substratum, sparingly and irregularly pinnate, the 

 branches widely spreading, not microphyllous but often with 

 deciduous leaves ; rhizoids few : leaves loosely imbricated, the lobe 

 plane, slightly falcate, ovate, 0.5 mm. long, 0.35 mm. wide, antical 

 margin rounded at the base, arching partially across the axis and 

 outwardly curved to the apex, postical margin straight or nearly 

 so, apex broad, rounded to very obtuse, margin entire or slightly 

 and irregularly crenulate from projecting cells ; lobule inflated, 

 ovate in outline, 0.17 mm. long, o. 1 mm. wide, keel slightly 

 arched, free margin curved, involute near the base, apical tooth 

 curved but variable in length and sometimes short and blunt, 

 papilla in a slight depression, sinus lunulate ; cells of lobe plane, 

 averaging 10 /u at the margin, 12 fj. in the middle and 16/i at the 

 base, rather thick -walled but without distinct trigones ; ocelli 

 23 x 16 ft, one or two at the base of the lobe, usually indistinct 

 or obsolete : underleaves distant, plane, orbicular, 0.2 mm. long, 

 broadly cuneate at the base and without a distinct radicelliferous 

 disc, bifid about one half with erect divisions, rounded or obtuse at 

 the apex and separated by a narrow and usually acute sinus, 

 margin either entire or vaguely angular-dentate on the sides : 

 inflorescence dioicous : 9 inflorescence on a more or less elon- 

 gated branch, innovating on one side, the innovation often flor- 



iferous ; bracts and bracteoles similar to those of R. flagelliformis : 



perianth, (f inflorescence and sporophyte unknown (plate 2, 



figures 1 



On bark of trees. North slope of the Luquillo Mountains, 

 Heller {4.741 p. p.). The original specimens were collected by 

 Wright in Cuba, and no other stations for the species are at present 

 known. 



R. emarginuliflora is based on somewhat negative characters 

 and is still too imperfectly known to be considered a well-established 

 species. It agrees with R. Berteroana in its dioicous inflorescence 

 and in the general characters derived from leaves and underleaves. 

 Even the leaf-cells are of about the same size in the two species 

 and agree with each other in the characters derived from their 



