SOUTH AFRICAN HEPATIC.E. 437 



iil^pcr surface ; lunate scales or ridges often present in rows on 

 the under-surface, each usually bearing at first an appendage, 

 which in its youngest stage folds over and protects the growing 

 point, which consists of a group of initial cells. Smooth and 

 tuherculate rhizoids usually both present. Sexual organs either 

 embedded separately in the thallus or collected into groups 

 (special rece]>tacles), which are either sessile or more or less 

 pedunculate. No columella present. 



Family 2. Txtcciace.e. Antheridia and archegonia im- 

 mersed singly in cavities of the U])pcr surface of tb.e thalhis. 

 Sterile cells not present among the spores. 



Coins 2. Eiccia. Small terrestrial or aquatic thalloid plants. 



2. R. albomarginata Besch. 



3. R. bullosa Link. 



4. R. concava Besch. 



5. R. fiuitans Linn. = Ricciella. 



3b. R. fluitans Linn. z-ar. angustifolia. 



(S. R. limbata Besch. 



7. R. natans Linn. := Ricciocarpus. 



8. R. purpurascens L. & L. = Ricciella. 



9. R. sp. 



Family 3. Targioniace.^. Archegonial group terminal, 

 sessile, enclosed in two scales ; antheridia on special short 

 branches. Elaters 2-3-spiral. 



Genus 3. Targionia. Small thalloid plants, on alluvial soil. 



10. T. capensis Hiib. 



Family 4. AIarchantiace.^. Antheridia and archegonia in 

 separate grou])s : archegonial groups placed on peduncled recej)- 

 tacles ; sterile cells (usually spiral elaters) present among the 

 spores. 



Section i. Operculatae. Capsule dehiscing irregularly, or 

 liv its lid becoming detached in one piece. 



Sub-section i. Carpocephala dorsal, produced in succession 

 on the thallus surface, the peduncle not grooved or furrowed. 



Coins 4. Plagiochasma. Involucres i to 4, with one arche- 

 gonium in each, and erect through absence of dorsal ti>sue on 

 the rece})tacle. 



11. P. sp. Rhodesia. 



Sub-section 2. Carpocephalum terminal, its peduncle 

 grooved (except Lnnuliiria } . Involucres horizontal or ])endent, 

 often containing more than one archegonium. 



Coins 5. Rebotilia. Capsule cap falling away in frag- 

 ments. Perianth none. 



12. R. hemispherica Raddi. = Marchaniia hoiiisphcrica 



Linn. 

 Asterella lionisplierica P. de B. 



Coins 6. Grimaldia. Capsule ca]) se])arating as a distinct 

 Jid. Perianth none. 



13. G. sp. 



