~CERAMIEÆ~ ^Callithamnion^ ^C. americanum^ ^C. Pylaisæi^ ^C. Baileyi^ ^C. seirospermum^ ^C. byssoideum^ ^C. floccosum^ ^Griffithsia^ ^G. Bornetiana^ ^Ptilota^ ^P. serrata^ ^P. elegans^ ^P. densa^ ^P. hypnoides^ ^Spyridia^ ^S. filamentosa^ ^Ceramium^ ^C. rubrum^ Var. ^proliferum^ Var. ^secundatum^ ^C. strictum^ ^C. diaphanum^ ^C. fastigiatum^ ^C. tenuissimum^ Var. ^patentissimum^ ^Microcladia^ ^M. Coulteri^ ^M. borealis^ Order =CRYPTONEMIACEÆ= ~GLOIOSIPHONIEÆ~ ^Gloiosiphonia^ ^G. capillaris^ ~GRATELOUPIEÆ~ ^Halymenia^ ^H. ligulata^ ^Grateloupia^ ^G. Cutleria^ ^Prionitis^ ^P. lanceolata^ ^P. Andersonii^ ~DUMONTIEÆ~ ^Pikea^ ^P. Californica^ ^Halosaccion^ ^H. ramentaceum^ ~RHIZOPHYLLIDEÆ~ ^Polyides^ ^P. rotundus^ ~SQUAMARIEÆ~ ^Peyssonnelia^ ^P. Dubyi^ ^Petrocelis^ ^P. cruenta^ ^Hildenbrandtia^ ^H. rosea^ ~CORALLINEÆ~ ^Corallina^ ^C. officinalis^ ^Melobesia^ Order =BANGIACEÆ= ^Bangia^ ^B. fusco-purpurea^ ^Porphyra^ ^P. vulgaris^ ^P. laciniata^ [pg079] RED SEAWEEDS In =Rhodophyceæ=, known also as =Florideæ= and =Rhodospermeæ=, algæ attain their highest development. This is marked by the mode of reproduction, which, more nearly than in the other subclasses, resembles that of flowering plants. The fronds, however, are not as large and do not as closely resemble stem and leaf as do some species of the brown algæ.