HEPATIC^E. (LIVERWORTS.) 687 



at the npex, 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>. liirsilta, Nees. Dioecious; frond 4' -6' long, 6" -10" wide, fork- 

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

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

 The largest of our Marchantieae : fruit rare. (Tab. 20.) 



8. FEGATELLA, Raddi. GREAT LIVERWORT. (Tab. 20.) 



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. Fronds 3' - 6' long, 5" - 9" wide. Springy places. 

 Among the largest of our Hepaticae : seldom seen in fruit. (Tab. 20.) (Eu.) 



9. KEBOLLIA, Raddi. (Tab. 20.) 



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. he inisphcfericil, Raddi. ^Frond forking, and increasing by joints 

 from the extremities, green above, purple beneath ; the peduncle bearded at its 

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

 shady moist places. (Tab. 20.) (Eu.) 



2. R. Illicrocephala, 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 paleae at its base and apex. Pennsylvania, Lesquereux. 



IO. GRIJWAL.DIA, Raddi. (Tab. 21.) 



Fertile receptacle hemispherical or conoklal, 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. Calvptra persistent at the base of 

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



