6 BTNOP8I8 OF BBITI8B BEAWEED8. 



spores, on a a ntrcU placenta : _. 

 spores either dispersed indefinitely, or forming cloud-like 

 patches. 

 * Frond flat, leaf-Wee, dichotomous or palmate. 

 LIY. ? Stenogramme. Conceptacles Linear, rib-like. (Sorl 



definite.) 

 tSV. Rhodymenia. Conceptacles hemispherical, scattered. 



** Frond compressed or terete, shrubby, much branched. 

 LVI. Sph^rococcus. Frond linear, two-edged, disti- 

 chous, traversed by an obscure midrib. 

 LVJLL. Gracilaria. Frond filiform (rarely compressed or 

 flat), irregularly branched ; the central cells very large. 

 LVI II. Hypnea. Frond filiform, irregularly branched, 

 traversed by a fibro-cellular axis. 



Order 12. Cryptonemiack.k. Purplish or rose-red sea 



with a filiform or (rarely) expanded, gelatinous or cartila- 

 ginous frond , composed) wholly or in part, of cylin 

 cells, connected together into threads or filaments. Axis 

 fanned of vertical, periphery of horizontally excentric fila- 

 ments. Fructification double : 1. Conceptacles (favellidia) 

 globose masses of spores immersed in the frond, or in swell- 

 in gs of the branches : 2. Tetraspores variously dispersed. 

 Sub-order 1. Coccocarpe.e. Frond solid, dense, cartilaginous 

 or horny. Favellidia in semi-external tubercles or swellings 

 of the frond. 

 LIX. Grateloupia. Pinnated, flat, membranaceo-cartila- 

 ginous, of very dense structure. Favellidia with a 

 pore. Tetraspores scattered. 

 LX. Geltdium. Pinnated, compressed, horny, of very 

 dense structure. Favellidia in swollen raniuli, imper- 

 forate. Tetraspores in sori. 

 LXI. Gigartina. Frond variously branched, cartilagi- 

 nous ; its flesh composed of anastomosing filaments, 

 lying apart in firm gelatine. Favellidia in external 

 tubercles. Tetraspores contained in dense, immersed 

 sori. 



Sub-order 2. Sponoiocarpe.e. Frond solid, dense, cartilagi- 

 nous or horny. Favellidia (of several) imperfectly known. 

 Wart-like swellings (or nemathecia) composed of fila- 

 ments, sometimes changed into tetraspores ; sometimes into 

 spores. 

 LXII. Chondrus. Frond flabelliform, dichotomously cleft, 



