43*^' SOUTH AFRICAN IIKPATIC.V:. 



The HepaticK known meantime are abunt as under : — 



Genera. Species. 



Whole World 250 4,500 



Britain (Macvicar's Handbook, iyi2) .... yi, 274 



}\Iadagascar and Mascarenes ( Renauld's 



"Flore Bryologique "), 35 genera and 



22 sub-genera of Lejeunea, treated 



above as genera 57 222 



South Africa, as per this list, 47 genera and 



12 siib-genera of Lejeunea, treated above 



as genera 50 163 



So, unless South .Vfrica is proportionate!}- very low in species, 

 many more still remain to be discovered, and it is quite pro- 

 bable that some included in the present list will still ])rove to 

 be s\'non\'ms. 



Exi'LANATioN OK Unusual Tt-xhnical Tkrms l'si-:]) in 



Following List: 



Jncubous, hwi'cs oi'crlap upward on froiil of sicii:. 

 Snccubous, Iccwcs overlap doK'uuiard 011 front of the si cm. 

 FolioJes, aniphif/aslrio or iinderlcaz'cs : the small leai'es on 



underside of stem formijig the third row. 

 Lobule, the smaller lobe of a two-lohed leaf. 

 Marsui)iuni. a speeiallx-developed lube, often sueeuleuf and 



coiif/lomerate. surrouiidinij /he sporo<jonium. 



SYNOPTICAL LLST. 



Order L SPH.F:R0C\'\RPALES. 



Sexual (U-gans superficial and almost sessile, but each 

 separately enclosed in a s])ecial envelope develoj^ed from tlie 

 thallns, and extending beyond the enclosed organ. Sterile cells 

 are mixed among the spore^, but no spiral elaters ; the capsule 

 is single-layered, without fibrous thickenings, and bursts 

 irregularly. LTsually thalloid with no air-chambers in the 

 thallns, but with or without leaves in addition. Rhizoids smooth. 



Family i. Riellace.t;. Stem erect with one undulate 

 one-layered dorsal thalloid expansion, and sometimes also pi"o- 

 vided with small leaves from each side of the stem. Archegonia 

 in flask-like enveloi)es on the stem along the base of the wing; 

 antheridia on the free edge of the wing enclosed separately in 

 specially thickened portions of the wing. 



Genus r. Riella. Characters as above. Aquatic, submerged. 

 1. I\. capensis. Cav. Port Elizabeth. 



Order XL ^TARCHANTL\LES. 



Thalloid, the thallus usually differentiated into (T ) a 

 hyaline epidermis; (2) an upper zone of green tissue, with or 

 without air-chambers; (3) a lower zone of large-celled hyaline 

 tissue. I^ores from the air-chambers usually present in the 



