EXPLANATION OF THE PLATES. 741 



membranous rudiment of the inner peristome and a portion of the annulus, of A. 

 obtusifolius, Br. If Sch. 



» OMALIA. — Plant, capsule with operculum, part of the peristome (one tooth, two cilia, one 

 ciliola, and a portion of the annulus), and calyptra, of 0. Wrightii, Suiliv. 



HYPNUM. — Plant, two capsules with opercula, part of the peristome (one tooth, one cili- 

 um, and two ciliolae, with a portion of the annulus), and a calyptra, of H. salebrosum, 

 Hoffm : after Schimper. 



Genera of Hepaticse. 



Tab. VI. 



BICCIA. — Plant ; vertical section of the frond (showing two imbedded capsules and numer- 

 ous large air-cavities) ; spores enclosed in a mother-cell ; three free spores ; and calyp- 

 tra with its style, of R. natans, L. : after Bischoff. 



• ANTHOCEROS — Plant ; portion of the two valves of the capsule and the columella, togeth- 



er with spores and elaters ; two spores and two elaters, of A. laevis, L. 



• NOTOTHYLAS. — Plants ; vertical section of the frond through the involucre, showing the 



capsule ; apex of the capsule protruding from the end of the involucre ; lower half of 

 the capsule showing the columella ; upper half of capsule ; a gemma ; an antheridium ; 

 twelve free spores and two clusters of spores (4 in each), of N. valvata, Suiliv. 

 REBOULIA. — Plant ; fertile receptacle viewed from above ; the same from below ; capsule 

 dehiscing with remains of the calyptra at its base ; vertical section of the male disk, 

 showing the imbedded antheridia ; an elater ; portion of the same ; and three spores, 

 of R. hemisphasrica, Raddi : after Bischoff. 



SPH35ROCARPUS. — Plant; a cluster of 5 involucres ; an involucre enclosing a capsule ; a 

 capsule filled with spores ; and three spores, of S. Michelii, Bellardi: after Schweinitz. 



• DUMORTIERA. — Plants (portions of), male and female ; fertile receptacle, showing three 



involucres, each with a oapsule ; capsule partly covered by the calyptra ; vertical sec- 

 tion of the male disk, showing the imbedded antheridia ; an elater, portion of the 

 same ; and three spores, of D. hirsuta, Nees. 



• PHAGIOCHASMA. — Plants ; triangular fertile receptacle with its three large involucres 



seen from above ; same viewed sideways ; involucre with one side cut away, showing 

 the capsule and remains of the calyptra ; a capsule with remains of calyptra at its base 

 before dehiscence ; same after dehiscence ; an elater ; a piece of same more magnified ; 

 and two spores, of P. Wrightii, Suiliv. 



FEGATELLA. — Plants (portions of), male and female ; a vertical section of the fertile recep- 

 tacle, showing two involucres, each with a capsule ; capsule with its calyptra ruptured 

 at the apex ; vertical section of male disk showing the antheridia ; two elaters ; por- 

 tion of an elater ; and two spores of F. conica, Corda : after Bischoff, partly. 



PREISSIA. — Plants (portions of), male and female ; a vertical section of the fertile recep- 

 tacle ; perianth, calyptra, and capsule ; two elaters ; portion of an elater ; two spores; 

 md vertical section of part of the male disk, showing the imbedded antheridia, of P. 

 commutata, Nees : after Bischoff, partly. ; 



MARCHANTIA — Plants (portions of), male and female ; vertical section of the fertile recep- 

 tacle ; perianth, calyptra, and capsule ; an elater ; portion of the same ; five spores ; a 

 vertical section of a part of the male disk, showing the imbedded antheridia, of M. 

 polymorpha, L. : after Bischoff, partly. 



FIMBRIARIA. — Plants ; a fertile receptacle ; vertical section of the same ; a capsule de- 

 hiscing ; two elaters ; and two spores, of F. tenella, Nees. 



• STEETSIA — Plant ; portion of the frond, with involucre, perianth, and calyptra ; invo- 



lucre and perianth cut away so as to show the young calyptra ; capsule before dehis- 

 cence ; the same after dehiscence ; antheridium with its perigonial leaf; an elater; 

 and two sporules, of S. Lyellii, Lehm. 



