Ser. RuopOsPERMEs. Kam. Rhodymeniacee, 
Prats CCXCIX. 
RHABDONIA VERTICILLATA, Harv. 
Gen. Cuar. 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 fila- 
ments, containing moniliform strings of spores, radiating from a cen- 
tral placenta; 2, zonate ¢etraspores dispersed through the superficial 
stratum.—Ruasponra (Harv.), from pasos, a twig; in allusion to 
the twiggy ramification of the species. 
Frons filiformis, decomposite ramosa, tubulosa ; tubo filis longitudinalibus ramosis 
anastomosantibus percurso ; strato peripherico ex cellulis angulatis superficiem 
versus minoribus contexto. Fruct.: 1, cystocarpia infra stratum periphericum 
suspensa, reticulo filorum velata, carpostomio demum aperta, fila sporifera 
moniliformia a placenta centrali emissa continentia ; 2, tetraspore zonatim 
divise, per ramos minores sparse, immerse. 
Ruasponta verticillata ; stem short and thick, solid, beset with wart-like 
abortive ramuli, and emittmmg numerous decompound branches ; 
branches constricted at intervals into pseudo-joints, and whorled at 
the nodes with similarly constricted lesser branches and ramuli; in- 
ternodes of the branches linear-oblong, many times longer than broad, 
of the ramuli oval or shortly oblong, the terminal acute; tetraspores 
immersed in the ramuli. 
R. verticillata; caule brevi incrassato solido dense verrucoso ramos numerosos 
decompositos emittente, ramis articulato-constrictis ad nodos ramis minoribus 
conformibus verticillatis, internodiis ramorum lineari-oblongis diametro plu- 
ries longioribus, ramulorum ovalibus v. breve oblongis, terminalibus acutis, 
tetrasporis in ramulis immersis. 
Ruasvonta verticillata, Harv. in Herb. T. C. D. (1852.) 
ErytHrocitonium Muelleri, Harv. Alg. Exsic. Austr. n. 390; Fl. Tasm. v. 2. 
p- 322. (excl. syn.) 
Has. South Australia, Dr. Curdie! Port Philip, plentifully, VW. H. 7, 
Dr. Mueller! Western Port, Dr. Mueller! Georgetown, Tasmania, 
W. HOH. 
Geroer. Distr. South coast of Australia. Tasmania. 
Descr. Root a large, knobby, thick disc. Fronds one or more from the same 
base, 3-12 inches long, very much branched, and bushy. Main stem thick, 
solid, hard, once or twice forked, or irregularly divided, almost always 
