272 HANDBOOK OF BRITISH HEPATICiE. 



v r ery short peduncle, cut half way down into 

 seven or eight obtuse revolute segments. Elaters 

 bispiral. The receptacle is marked on the top 

 with a cruciate crest, which is obtusely four- 

 lobed (fig. 189). 



Genus 44. REBOULIA, Nees. 



Female receptacle pedunculate, conical, 

 hemispherical or plane, 1 - 6 lobed; lobes 

 parted nearly to the middle ; peduncle con- 

 tinuous with the frond, involucrate at the 

 base, bearded at the apex. Perianth none. 

 Calyptra oval, then saucer-like at the base of 

 the fruit, or obsolete. Capsule hidden by the 

 valves of the involucre, subglobose, irregu- 

 larly torn at the vertex or suboperculate, very 

 shortly pedicellate ; pedicel immersed in the 

 receptacle. Elaters bispiral. Male receptacle 

 sessile, discoid. Vegetation frondose. 



Reboulia hemisphaerica, Raddi. 



Fronds prostrate, flat, overlapping, gener- 

 ally forked, and waved at the margin, of a dark 

 green colour. Midrib prominent. Receptacle 

 cut at the margin into from four to ten equal 

 lobes, covering as many involucres, which are 

 not toothed. Easily distinguished by the deeply 

 divided 4-5-fid receptacle, which is barbate 

 beneath and at the base of the peduncle. 



