Ser. EnoDOSPERMEiE. Fam. Rhodi/meniacea. 



Plate CXVII. 



ARESCHOUGIA? SEDOIDES, Haw. 



Gen. Char. Frond compressed or filiform, vaguely branched, composed 

 of an articulated axial filament, and three (rarely but two) strata 

 of cells ; the medullary stratum consisting of longitudinal, anasto- 

 mosing, interwoven filaments ; the intermediate (sometimes absent) of 

 several rows of roundish, coloured cells ; the cortical of minute, ver- 

 tically seriated cellules. Friictijication : 1, conceptacles immersed in 

 the frond, suspended among the filaments of the medullary stratum, 

 and enclosed in a network of filaments, opening by an external pore, 

 and containing moniliform strings of spores, radiating from a central 

 placenta ; spores roundish ; 2, zonate tetraspores, formed on the cor- 

 tical stratum of the ramuli. — Areschougia {Harv.), in honour of 

 Dr. J. E. Areschoug, Professor of Botany at Upsal, a distinguished 

 algologist. 



Fro7is compressa v. Jiliformis, vage ramosa, immerse costata, e filo centrali arti- 

 culato et stratis fere tribus cellularum constituta. Stratum medidlare ejilis 

 articidatis longltudinalihus anastomosantibus intertextis, intermedium (nunc 

 dejiciens) e cellidis rotnndatis majusculis pluriseriatis, corticate e cellulis mi- 

 nimis verticalibus formatum. Fruct.: 1, cystocarpia fronde immersa, inter 

 Jila strati medullaris suspensa, reticuio filorum velata, carpostomio demum 

 aperta, Jila sporifera moniliformia a pdace^ita centrali emissa continentia ; 

 spora subrotundce ; 2, tetrasporcB zonatim divisce, inter cellulas corticales ra- 

 mulorum nidulantes. 



Areschougia ? sedoides ; frond filiform, subdichotomous, or irregularly 

 branched; branches densely set with short, obovoid or pyriform, 

 quadrifarious ramuli; conceptacles and tetraspores formed in the 

 ramuli (of different individuals). 



A. sedoides ; fronde Jiliformi siibdichotome v. vage ramosa ; ramis ramulis bre- 

 vissimis obovoideis qiMdrifariis omistis ; friictu iitriusque generis in ramulis 

 evoluto. 



Hab. Thrown up from deep water. Near Fremantle, Swan Eiver, Mylne, 



W. H. IL, G. CUftoii. 

 Geogr. Distr. Western Australia. 



Descr. Root thickened, somevvliat bulbous. Frond filiform, as thick as whip- 

 cord, 4-6 inches long, and as much in the expansion of the branches, several 

 times irregularly forked ; the divisions virgate, erecto-patent, 1-2 inches 

 long. All the younger branches are densely beset, on all sides, with minute, 



