98 THE MARINE BOTANIST. 



ANALYSIS OF THE TRIBES. 



Frond with a calcareous coating. 



Corallinaceye. 

 Frond cellular or filiform, not encrusted . 



Fronds (usually) filiform, and jointed either 

 externally or internally, or composed of 

 articulated fibres, combined tog'ether by 

 gelatine 



Fronds continuous . . . . 



/Spores contained in external urn-shaped 

 receptacles (ceramidia), 



Rhodomelacese. 

 Spores not in ceramidia .... 

 /Spores contained in naked berry-like re- 

 ceptacles, termed favellce. Ceramiaceae. 

 Spores immersed in the frond or sub- 

 external. Cryptonemiacese. 



j'Tetraspores scattered .... 

 5 / Tetraspores in defined spots. 



Delesseriacese. 



3 



i 



