A minute species, with a pinnated habit, not unhkc a minia- 

 ture Fern, and sufficiently marked by the creeping primary 

 tlu'eads, the coloured sacculus of the joints, and the position of the 

 tetraspores. I have not seen an authentic specimen of Suhr's 

 plant, to which I venture to refer. 



Fig. 1. Ceramium miniatum, growing on a young frond of Bictyota Kunthii, 

 • — the natural size. 2. Pinna, with tetraspores. 3. Apex of one of the di- 

 visions of the same. 4. Pinna, with faveilse. 5. Apex of a division, with 

 its terminal involucre containing favellse. 6. Part of the creeping primary 

 filament : — magnijied. 



Plate CCVI. B. 



CERAMIUM ISOGONUM, Haw. 



Ceramium. isogonum ; frond minute (1-2 inches high), subsetaceous, diclio- 

 tomous, fastigiate ; segments erecto-patent, the terminal forcipate ; ar- 

 ticulations corticated, all of equal length and breadth, marked with a 

 hyaline medial line, but little constricted ; favellse subterminal, bi- 

 lobed, subtended by l-r2 ramuh; tetraspores prominent, whorled round 

 the branchlets. 



C. isogonum ; fronde pusilla (^l-2-unciali) subsetacea dichofoma fastigiata ; 

 segmentis erecto-patentibus, terminalibusforcipatis ; articulis corticatis omnibus 

 diametro cequalibus Unea hyalina centrali notatis medio parumque constrictis ; 

 favellis subterminalibus bilobis ramellis 1-2 fulcratis ; tetrasporis prominen- 

 tibus singula serie circa genicula verticillatis. 



Ceramium isogonum, Harv. in Trans. R. I. Acad. v. 22 p. 55. Rarv. Alg. 

 Austr. Exsic. n. 473. 



Hab. On Algffi, at Garden Island, W. R. H., C. Clifton. Port Fairy, 



W. H. H. 

 Qbogr. Distr. Western and southern coasts of Australia. 



Descr. Root a small disc. Frond 1-2 inches high, distantly dichotomous, 

 fastigiate, flabelliforra, with strongly hooked apices. Articulations of nearly 

 equal length and breadth in all parts of the frond, equally coated with co- 

 loured granules except on a narrow, medial, pellucid line. FavellcE ovoid, 

 in pairs near the ends of the branchlets, each pair subtended by 2-3 short 

 raniuli. Tetraspores very prominent, globose, whorled round the articula- 

 tions at or near the medial pellucid line. Colour a deep purple-red, be- 

 coming more crimsom in fresh-water. Substance soft, but not gelatinous. 

 In drying tlie plant adheres to paper. 



The very short, and nearly whole-coloured and equable joints 

 seem to mark this small and not very common species. 



B. Pig. 1. Ceramium ISOGONUM, — the natural size. 2. Branchlets, with fa- 

 vellaj. 3. A favella. 4. Brauchlet, with tetraspores. 5. Atetraspore: — 

 iuagnijled. 



