HEPATIC^, (liverworts.) (87) 687 



at the apex, persistent. Capsule oblong-globose, dehiscing by 4-6 irregular 

 valves; pedicel short. Spores muriculate. Elaters very long, attenuated at 

 each end. Antheridia immersed in short-peduncled disk-like receptacles. 

 (Named for B. C. Dumortier, a Belgian botanist.) 



1. I>. Mrsnta, Nees. Dioecious; frond 4'- 6' long, 6" -10" wide, fork- 

 ing, thin, deep green ; feiiile receptacle and involucres and margin of the male 

 disk hairy; peduncles chaffy at the apex. — Faces of rocks, Southern States. 

 The largest of our Marchantiese : fruit rare. (Tab. VI.) 



8. FEGATEL.L.A, Raddi. Great Liverwort. (Tab. VI.) 



Fertile receptacle conical-mitriform, membranaceous. Involucres 5-8, tubu- 

 lar, 1-fruited, suspended from the apex of the peduncle, coherent with the inte- 

 rior surface of the receptacle, and with each other, opening at the lower end by 

 a slit. Perianth none. Calyptra persistent, bell-shaped, 2-4 lobed at the apex. 

 Capsule oblong-pyriform, dehiscing by 5 - 8 revolute segments, deciduous with 

 its short pedicel. Spores muriculate. Elaters short and thick. Inflorescence 

 dioecious. Antheridia immersed in sessile oval disks, near the apex of the frond. 

 Frond forking, conspicuously reticulated, with a narrow distinct midrib. (A 

 personal name.) 



1. F. conica, Corda. Fronds3'-6^ong, 5"-9"wide, — Springy places. 

 Among the largest of our Hepatic^ : seldom seen in fruit. (Tab. VI.) (Eu.) 



9. REB01JL.IA, Raddi. (Tab. VI.) 



Fertile receptacle conic-hemispherical or flattened, 4-5-lobed. Involucres 

 4-5, 1-fruited, opposite to and coherent with the lobes on the under side, 2- 

 valved. Perianth none. Calyptra minute, lacerate, persistent at the base of the 

 capsule. Capsule globose, nearly sessile, rupturing irregularly at the apex. 

 Spores muricate. Elaters moderately long. Inflorescence monoecious. Anthe- 

 ridia immersed in sessile crescent-shaped disks. Frond rigid ; the midrib broad, 

 strong, and distinct. (Named for E. Reboul, an Italian botanist.) 



1. B. liemispliserica, Raddi. Frond forking, and increasing by joints 

 from the extremities, green above, pm-ple beneath ; the peduncle bearded at its 

 base and apex ; fertile receptacle papillose on the summit. — Hilly districts, in 

 shady moist places. (Tab. VT.) (Eu.) 



2. B. microcepliala, Taylor. Distinguished from the preceding (of 

 which it may be a form) by the more delicate texture of the frond, and by the 

 smaller size of all its parts, except the peduncle, which is very long (3' -4'), 

 with broader palese at its base and apex. — Pennsylvania, Lesquereux. 



10. OBIMAEDIA, Raddi. (Tab. VH.) 



Fertile receptacle hemispherical or conoidal, 3-4-lobed. Involucres 3-4, 

 each a distention of an entire lobe of the receptacle, and opening by a cleft 

 below, 1-fruited. Perianth none. Capsule globose, filling the involucre, dehis- 

 cing by a circumcissile line near the middle. Calyptra persistent at the base of 

 the capsule. Spores rugose, with a transparent border. Monoecious or dice- 



