1 48 EVANS 



gones and intermediate thickenings, cuticle smooth, ocelli none ; 

 underleaves distant to subimbricated, orbicular, 0.2 mm. long, 

 bifid about one half with a narrow and blunt sinus and triang- 

 ular, erect divisions, rounded to acute at the apex, margin entire 

 or vaguely and irregularly sinuate on the sides ; inflorescence 

 autoicous ; female inflorescence borne on a leading branch, in- 

 novating on one side, the innovation simple or branched, some- 

 times terminating in a male spike ; bracts obliquely spreading, 

 complicate and unequally bifid, keel not winged, lobe oblong, 

 0.6 mm. long, 0.3 mm. wide, rounded at the apex, entire, lobule 

 oblong to ligulate, 0.4 mm. long, 0.12 mm. wide, rounded at 

 the apex, entire ; bracteole connate on both sides at base, ovate 

 to obovate, 0.4 mm. long (to junction with bracts), 0.3 mm. wide, 

 bifid about one half with a narrow sinus and erect, subacute 

 divisions, margin irregularly sinuous ; perianth about half ex- 

 serted, obovoid, 0.65 mm. long, 0.4 mm. wide, narrowed toward 

 the base, rounded at the apex and with a short but distinct beak, 

 inflated and with 5 low keels in the upper part, surface smooth ; 

 male inflorescence occupying a short branch or terminal on a 

 longer branch, bracts mostly in from 2 to 4 pairs, closely imbri- 

 cated, shortly and subequally bifid with rounded divisions, 

 bracteoles present at base of spike, similar to the underleaves, 

 antheridia borne singly ; capsule brown, spherical, 0.35 mm. 

 in diameter, spores irregular in form, about 23 {jl wide, minutely 

 verruculose. 



Type locality, Mount Yokogura, Tosa, on bark. Collector, 

 Okamura (no. 67), March, 1904. 



Lejeunea planiloba agrees with other members of the genus 

 in its delicate texture, in the structure of the apical portion of 

 the lobule and in the 5-keeled perianth, as well as in other less 

 important respects. Its subrectangular, relatively large lobule 

 is perhaps somewhat aberrant and will at once serve to distin- 

 guish it from L. cavifolia (Ehrh.) Lindb. and L. flava (Sw.) 

 Nees. Only one other species of the genus has been reported 

 from Japan, namely, Eulejcunca co7iipacta Steph. In this spe- 

 cies the leaves are described as acuminate, so that it could hardly 

 be confused with L. -planiloba. 



The new species bears a certain superficial resemblance to 



