c^ 



Hepatico' of North Aniorira. 21 



Capsule more or less peduucled, columella present. 



Order III. Anthocerotace^. 



Capsule sessile; columella wanting: Targionia in Order 

 1^ IV. Marchantiace^. 



In the following pages no attempt has been made at a 

 complete bibliography or sjaionymy. References ai'e made to 

 Syn. Hep. = Gottsche, Lindenberg, and Nees' Synopsis^ Hepat- 

 icaruni, 1844, and Hep. Europ. ^^ Dumortier's Hepafira- Enro- 

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

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

 </er»ian)iia% 1816, and Ekart — Ekart's Sijuojj.^is Jioif/prmaunia- 

 rum (Termanicarmn, 1832. 



Order I. RIOCIAO^ 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 areola? and air cavities. 



Synopsis of G-enera 

 Spores separate; fruit immersed in the thallus. I. 



RiCCIA. 



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



Fruit immersed in the substance of the thallus. II. 

 Thallocarpus. 



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



B^. 



ROCARPUS. 



I. RiOOlA 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 li. 



