OBDERfl LND GEM Bfi v. .5 



XXI. Dicttosiphon. Spores irregularly scattered, soli- 

 tary, or in dot-like sori, ii"! accompanied by monili- 

 funn threads. 



XXII. Sri: mima. Spores in dot-like *ort, ranged in trans- 

 verse lines. 



*** Root naked; frond wnbranehed, cylindrical or flat. 



XXI II. Punctabia. Frond flat, leaf-like. 



XXIV. A.8PBROCOCCU8. Frond membranaceous, tubular, 

 either cylindrical or compressed. Spores in dot-like 

 fori, mixed with a few jointed threads. 



XXV. Litosiphon. Frond cartilaginous, filiform, sub- 

 solid. Spores scattered, sub-solitary. 



r .".. Chobdabiai coloured seaweeds, with a ge- 



latinous <>r cartilaginous frond, composed of vertical "ml 

 horizontal filanu nts intt rlaced t<>'j< tht r. 



* Frond cylindrical, branching. 



XXVI. Chobdabia. Axis cartilaginous, dense; filaments 

 of the circumference unbranched. 



XXVTI. Mesogloia. Axis gelatinous, loose ; filaments of 

 the circumference branching. 

 ** Frond either tuber-shaped, or crustaceous and spreading. 

 XXV III. Leathesia. Frond tuber-shaped. 



XXIX. Ralfsia. Frond crustaceous. 



##* Parasites, consisting of densely tufted filaments, <-<nnnct<d a* 

 tin l>ii.<, . free above* 



XXX. Elachista. Filaments pencilled, rising from a tu- 

 bercular base, composed 01 vertical fibr 



XXXI. Mybionema. Tufts cushion-like ; filaments rising 

 from a Hat base, composed of decumbent fibres. 



Order 6. EcTOCARPACRffi. Olive-coloured, articulated, filiform 



eds, whosi -: generally) external, attached to 

 the jointed ramuli. 

 * Frond rigid; each articulation composed of numerous cells, 



\ 1 1. Ci ldostepb us. Eamuli whorled. 



XXXIII. Sphacelabia, Eamuli distichous, mostly pin- 

 nated. 



** Frondflaccid ; each articulation formed <>/ << sin;/!' cell. 



XXXIV. E< po< lbpus. Frond branching; ramuli scat- 

 red. 



XXXV. M YKiniKK in \. Frond unbranched: ramuli 

 whorled, and tipped with pellucid fibreSt 



