Ser. RnoDOSPERMEiE. Fam. Rhodymeniacem. 



Plate CXXIX. 



RHABDONIA? GLOBIFERA, /. 4/. 



Gen. Char. Frond filiform, decompound, imperfectly tubular; tube partly 

 filled with longitudinal, branching and anastomosing filaments ; peri- 

 pheric stratum composed of polygonal cellules, smaller toward the cir- 

 cumference. Fructification: 1, conceptacles immersed in the branches, 

 suspended among the axial filaments, and enclosed in a network of 

 filaments, containing moniliform strings of spores, radiating from a 

 central placenta; 2, zonate tetraspores dispersed through the super- 

 ficial stratum. — Rhabdonia {Harv.), from pa^So^, a tioig ; in allusion 

 to the twiggy ramification of the species. 



Fronsfiliformis, decomposite ramosa,tuhulosa ; tubo fills longitudinalibus ramosis 

 anastomosantibus percurso ; strata per ipherico ex cellulis angulatis siiperficiem 

 versus minoribus contexto. Fruct. : 1, cystocarpia infra stratum periphericum 

 suspensa, reticulo fitorimi velata, carpostomio demum wperta, fila sporifera 

 moniliformia a placenta centrali emissa continentia ; 2, tetrasporce zonatim 

 divisa, per ramos minores sparsce, immersee. 



Rhabdonia globifera ; frond terete, sparingly branched ; branches virgate, 

 densely beset on all sides with obovate, saccate ramuli. 



R. globifera ; fronde terete crass'mscula simpliciuscula vet parce ramosa ; ramis 

 virgatis 7'amuUs obovatis saccatis undique densissime obsessls. 



EnABDONiA? globifera, /. Ag. Sp. Alg. v. 2. p. 355 ? {exct. syn. plur.). 



Fucus globiferus, Lamour. in Herb. Faris. ?, fide J. Jg. I. c. 



Hab. Coasts of New Holland, Herh. Paris. Near Fremantle, Western 



Australia, G. Clifton. 

 Geogr. Distu. West coast of Australia. 



Descr. Root a bulbous tubercle. Stems two or more from the same base, 6 

 inches high, \ a line in diameter, simple or alternately or vaguely branched ; 

 the branches erecto-patent, quite simple, virgate, the younger parts con- 

 stricted at the nodes. Both stem and branches are densely beset on all 

 sides with subhorizontal, imperfectly whorled, obovate, saccate, very obtuse 

 ramuli, 2-3 lines long, and nearly 1 line in diameter. These ramuli are 

 membranous, and filled with more or less densely interwoven, anastomosing, 

 longitudinal filaments ; the membrane consists of a single row of quadrate 

 or oblong, coloured cells. The stem has a similar structure, but more dense, 

 and its periphery is formed of two or more rows of cells. The fruit is 

 unknown. The colour is a very dark brownish-red, turning darker in 



