II('))afir(r of Norf/i Aincricd. 21 



Capsule more or less pecluncled, columella present. 



Order III. Anthocerotace^. 



C ^' 



I Capsule sessile; columella wantintjj: Tarr/ioiiia in Order 



1^ IV. Marchantiace.*:. 



In the following pages no attempt has been made at a 

 complete bibliography or synonymy. References are made to 

 Syn. Hep. --= Gottsche, Lindenberg, and Nees' Sijnopsis Hepai- 

 icarum, 1844, and Hep. Europ. ^ Dumortier's Hepaficw Kuro- 

 pcea, 1874, where a more complete synonymy may be found. 

 For figures reference is to Brit. Jung, --=^ Hooker's British Jun- 

 gennannice, 1816, and 'E,kart=='Eka,rt''s SijnojJsis Jtingermannia- 

 nim German icarum., 1832. 



Order I. RICCIACiE Endl. 



Terrestrial or pseudo-aquatic, chiefly annual plants with 

 thallose vegetation. Fruit short-pedicelled or sessile on the 

 thallus or immersed in it. Calyptra crowned with a more or 

 less deciduous colored style. Capsule either free or connate 

 with the calyptra, globose, at length rupturing irregularly. 

 Spores usually angular, reticulate or muriculate. Elaters want- 

 ing. Antheridia ovate, immersed in the thallus in flask-shaped 

 cavities with protruding mouths (ostioles). Thalli with or 

 without areolas and air cavities. 



Synopsis of Genera 



r Spores separate; fruit immersed in the thallus. I. 

 A J RiCCIA. 



I Spores in fours, united in a coccus or berry — B. 



f Fruit immersed in the substance of the thallus. II. 

 I Thallocarpus. 



Fruit aggregated, sessile on the thallus. III. Sph.e- 



[^ ROCARPUS. 



I. RIOOIA Mich. 



Fruit immersed in the thallus, sessile. Calyptra with a 

 persistent style. Capsule sessile within the calyptra. Spores 

 alveolate or muriculate. flattish and angular (except in /»'. 



