470 HEPATIC.^. 



The plant has also a pleasant aromatic scent. 



Description of Plate CCIX. — Fig. 1. Sterile frond, natural 

 size. 2,3. Male fronds, natural size. 4. Portion of cross-section 

 of frond x 24. 5. Portion of frond, postical layer of cells x 85. 

 6, 7. Scales from postical side of frond x 24. 8, 9. Female 

 receptacles, natural size. 10. Ditto, magnified (Bischoft). 11. More 

 highly magnified (ditto). 12. Cross-section of same, magnified 

 (ditto). 13. Caljptra [a) and capsule {b) magnified (BischoflP). 

 14. Capsule, explanate x. 15. Cross-section of male receptacle 

 x 11. IG. Antheridium x IG. 



Genus 47. REBOULIA, Raddi. 



Marchcmtia, Linn. Sp. pi. 1 ed., 2, p. 1138; Fl. Lapp. (1753). 



Asterella, p.p. Beauv. in Encycl. Meth. Suppl. 1, p. 502 (1810). 



RehouUa, Raddi in Act. soc. Modena 11, p. 357 (1818), (nom. em. ISTees, 1846). 



Frondose, fronds rigid, very indistinctly porose, the midrib 

 broad, strong and distinct. Female receptacle j^edunculate, 

 conical, hemispherical or plane, 1-G- (usually 4-) lobed, lobes 

 divided to about the middle, peduncle continuous with the frond, 

 barbulate-palaceous beneath. Outer involucre 1 -fruited, coherent 

 with the lobes, 2-valved. Perianth wanting. Calj-ptra oval, 

 minute, lacerate, persistent at the base of the capsule. Capsule 

 hidden by the valves of the involucre, greenish, subglobose, nearlj- 

 sessile, rupturing at the apex by irregular narrow teeth, or by a 

 fragmentary operculum. Spores tuberculate. Elaters moderately 

 long, mostly bispiral. Inflorescence monoicous. Andrtecia 

 sessile, lunate-disciform. 



Reboulia hemisphaerica, Bculdl. 



Marchantia hemtsphcprica, Linn. Sp. pi. p. IGOi (1753). 



Asterella hemispharica, p.p. Beauv. in Encjcl. Meth. Suppl. 1, p. 502 (181(1). 



Eeboidia hemisplia'rlca, Raddi in Act. soc. Modena 1], p. 357 (1818). 



Monoicous, ca^spitose, medium size, dark green above, purple 

 below and at margin. Fronds rigid, simple, bilobed or dichoto- 



