Evans: Hepaticae of Bermuda 133 



margin also more or less curved, apex broad, usually abruptly- 

 acute or apiculate, whole margin (except close to the'antical base) 

 minutely crenulate from projecting cells; lobule ovoid, 0.17 mm. 

 long, 0.1 mm. wide, inflated throughout, keel strongly arched, 

 forming an angle of about 90 with the postical margin of lobe, 

 free margin involute to beyond the apex, sinus straight to lun- 

 ulate, apical tooth blunt and straight, bearing a hyaline papilla at 

 its proximal base; cells of lobe averaging iy fi at the margin, 

 25 x 19/i in the middle and 35 x 23 fi at the base, more or less 

 convex, walls thin, trigones and the rather numerous intermediate 

 thickenings small but usually distinct, cuticle smooth, ocelli none : 

 underleaves distant, orbicular, 0.15 mm. long, bifid about one 

 half with erect, obtuse, acute or apiculate divisions and a narrow, 

 acute or obtuse sinus, margin everywhere crenulate from project- 

 ing cells, sometimes obscurely and bluntly unidentate on the sides : 

 inflorescence autoicous : 9 inflorescence sometimes on a very 

 short branch (with a single rudimentary leaf besides the bracts), 

 sometimes on a leading branch, innovating on one side, rarely on 

 both, the innovations usually sterile ; bracts erect-spreading, the 

 lobe ovate to obovate, 0.55 mm. long, 0.3 mm. wide, apex obtuse 

 to acute or apiculate, margin sparingly and irregularly angular- 

 dentate, otherwise crenulate, lobule ligulate, 0.4 mm. long, 0.08 

 mm. wide, mostly blunt at apex, crenulate ; bracteole slightly 

 connate on one side, ovate, 0.5 mm. long, o.^ mm. wide, bifid 

 about two fifths with erect and acute divisions separated by a nar- 

 row sinus, margin as in the bracts ; perianth about half exserted, 

 not compressed, oblong-obovoid from a somewhat narrowed base, 

 0.8 mm. long, 0.35 mm. in diameter, broad and truncate at the 

 apex with a short beak, sharply five-keeled, the keels narrowly 

 and obsoletely bialate in the upper part, the wings crenulate or 

 denticulate from projecting cells, rarely with a few teeth two cells 

 long in the apical region : tf inflorescence occupying a short 

 branch ; bracts in two or three pairs, closely imbricated, strongly 

 inflated, slightly and subequally bifid with blunt to subacute 

 divisions ; bracteole present at base of spike, similar to the under- 

 leaves but smaller; antheridia in pairs: mature sporophyte not 

 seen. (Plate 6.) 



The specimens from Flatts may be considered the type. 



Except for the five-keeled perianth, this new species has much 

 in common with the genus Prionohjeunea. The leaves, the leaf- 

 cells and the underleaves are very similar, and the lobule is con- 

 structed on the same plan, bearing a hyaline papilla at the proxi- 

 mal base of the apical tooth ; the latter, however, is straight 

 instead of curved, and the papilla is in a distinct depression. 



