SPONGIOCARPEjE. 151 



G. coRNEUM, var. /3. sesquipedale, Grev. 



„ var. 7. pinnatum, Grev. 



„ var. h. uniforme, Turn. 



„ var. 6. capillaceum, Turn. 



„ var. f. latifolium, Grev. 



J, var. ■?;. confertum, Grev. 



„ var. 0. flexuosum, Harv. 



„ var. t. aculeatum, Grev. 



,, var. /c. abnorme, Grev. 



„ var. X. pulchellum, Turn. 



„ var. fi. claviferum, Grev. 



J, var. V. clavatum, Grev. 



„ var. o. crinale, Grev. 



Order XIII. SPONGIOCARPEiE. 



Brown-red Sea-weeds with cartilaginous, cylindrical, hranch- 

 ing fronds composed of interlaced Jilaments closely set in 

 firm gelatine. Spores large, ohconical, radiating from a 

 central point, in external, wart-like conoeptacles ; tetra- 

 spores ohlong, cruciate, formed in the outer filaments of 

 the upper branches. 



Genus LVII. POLYIDES. 



Eoot an expanded, fleshy disc. Frond cylindrical, carti- 

 laginous, forkedly branched, composed of three series of 

 fibrous cells, springing one from the other : the cells of the 

 first, or central series, which occupy about half the dia- 

 meter of the frond, are cylindrical, branched, longitudinal, 

 and densely packed; those next to them, which form the 

 intermediate series, are large, oblong, coloured, and set in 

 forked fibres, which curve outwards, and pass gradually 

 from an almost erect to a horizontal position ; and those 

 which compose the external, or bark series, are minute, 

 oblong, forked, and perfectly horizontal. Spores in wart. 



