NEW HEPATIOE. 27^ 



16. J. externa, Tayl. ; caule implexo, procumbente, ramoso; 



foliis imbricatis secundis, concavis, grosse cellulosis, 



oblongis, bifidis, segmentis acutis, perichaetialibus trifariis, 



oblongo-lanceolatis, segmentis obtuse dentatis; calyce 



lineari-lanceolato, ore plicato, denticulato. 

 Hab. On bark; Observatory Inlet; North America. Dr. 



Scouler. 



Patches extensive, flat, whitish-green. Stems about £ inch 

 long. Stipules none. Shoots radicating, their summits 

 ascending. Perichcetia are short lateral shoots; their leaves 

 sometimes trifid, their segments obtusely dentate. Pedicells 

 short. Capsule linear-oblong. Differs from J. bicuspidata, 

 L., by the smaller size, the imbricated and secund leaves, 

 the dentate pericheetial leaves, and by the narrower calyx 

 whose cells are smaller. 

 17- J. exiliflora, Tayl. ; caule exiguo, subcsespitoso, surculis 



adscendentibus, subramosis ; foliis confertis, cordatis, 



bifidis, segmentis insequalibus, stipulis minutis bifidis; 



calyce terminali, obovato, 4-plicato, truncato, subcom- 



presso, laciniis integerrimis. 

 Jung, divaricata, e. exiliflora, Syn. Hepat. p. 136. 

 Hab. On charcoal ; Swan River; Mr. James Drummond. 



Tufts superficial. Fertile stems reddish-purple, the barren 

 more loose and reddish-green. Leaves crowded even at the 

 base of the shoots, larger towards the tops of the stems, 

 their margin flexuose, the greater segment frequently shews 

 a single tooth on one side of the base. Stipules very minute, 

 oblong, usually unequally bifid, sometimes nearly entire. 

 The three pericheetial leaves are connate at the base. Peri- 

 gonia terminal, often, however, in the course of the shoots. 

 Calyx obovate. Capsule oblong-ovate. Elateres filiform, 

 flexuose. Seeds round, reddish. This species strongly 

 resembles J. byssacea, Roth, and differs by the crowded, 

 cordate leaves, by the obovate calyx, whose lacinue are entire, 

 and by the presence of stipules. 

 18. J. unguiculata, Hook. fil. et Tayl. ; caule sparso, sim- 



