ORDERS AND GENERA. IX 



LIX. Grateloupia. Pinnated, flat, membranaceo-cartilaginous, of very dense 

 structure. Favellidia with a pore. Tetraspores scattered. 



LX. Gelidium. Pinnated, compressed, homy, of very dense structure. Favel- 

 lidia in swollen ramuli, imperforate. Tetraspores in sori. 



LXI. Gigartina. Frond variously branched, cartilaginous ; its flesh composed 

 of anastomosing filaments, lying apart in firm gelatine. Favellidia in ex- 

 ternal tubercles. Tetraspores contained in dense, immersed tori. 



Sub-order 2. Spongiocarpe^e. Frond solid, dense, cartilaginous, or horny. 

 Favellidia (of several) imperfectly known. Wart-like swellings {or ne- 

 mahtecia) composed of filaments, sometimes chanyed into tetraspores ; 

 sometimes into spores. 



LXII. Chondrus. Frond flabelliform, dichotomously cleft, cartilaginous ; of 

 very dense structure. Tetraspores in definite, immersed sori. 



LXIII. Phyllophora. Frond stipitate, rigid-membranaceous, proliferous ; of 

 very dense structure. Tetraspores in superficial sori, or in proper leaflets. 



LXIV. Peyssonelia. Frond depressed, expanded, rooting by the under surface, 

 concentrically zoned. Tetraspores contained in superficial warts. 



LXV. Gymnogongrus. Frond filiform, dichotomous, horny, of very dense 

 structure. Tetraspores in superficial warts. 



LXVI. Polyides. Root scutate. Frond cylindrical, dichotomous, cartilaginous. 

 Favellm contained in external, spongy warts. Tetraspores cruciate, im- 

 mersed in the branches. 



LXVII. Furcellaria. Root branching. Frond cylindrical, dichotomous, car- 

 tilaginous. Favella immersed in the pod-like swollen extremities of the 

 branches. Tetraspores similarly immersed, transversely zoned. {For correct 

 analysis, see Tab. CCCLVII. A.) 



Sub-order 3. Gastrocarpe.e. Frond gelatinoso-membranaceous, or Jlcshy, 

 hollow, or of lax texture within. Favellidia immersed in the central sub- 

 ttance of the frond, very numerous. 



LX.VJ.11. Di montia. Frond cylindrical, tubular. Favellidia immersed in the 

 wall of the frond. Tetraspores also immersed, cruciate. {For corrected 

 analysis, see Tab. CCCLVII. B.) 



IAIN. Ealtmsnia. Frond compressed or flat, gplatmoeo-membranaceous, the 



membranous surfaces connected by a few slender, anastomosing filaments. 

 FavelUd/a attached to the inner face of the wall. 



I.W. GlN ANN IA. Frond cylindrical, distended, traversed by a fibrous axis; the 

 walls membranaceous, connected with the axis by horizontal filaments. Jb- 

 velUdia attached to the walls. 



I.W I. k \i.ii mini \. Frond expanded, leaf-like, carnoso-membranons, solid, 

 of dense structure. Favellidia pimply, half-immersed in the frond, and 



i! i crei I out its surface. 



LWII. Ikidi\. Frond expanded, leaf-like, thick, carnoso-coriaceous, solid, of 



dense structure. Favellidia wholly immersed. 

 I.W 1 1 1. ( \ 1 1 \ !. i.i. \. Frond tubular, branched, constricted at intervals into 



oblong pseudo-articulations ; the tube traversed bj a few filaments. 



Sub-order l. Qloiocladisje. Frond loosely gelatinous; tie JUamemtt 



which it is ci>„ii><>sr<l lyim/ apart from (MM another, surruundal by a 



copious gelatine. Favellidia Unmet 

 I W1Y. Cbuoria. Frond crustaceous, skin-like. 



