Ser. RuoposrpeRMES. Fam. Ceramiacee. 
Puare CCLXXITI. 
CALLITHAMNION? PENICILLATUM, Zar». 
Gun. Cuar. Frond filiform, branched, articulated, monosiphonous, the 
stem and branches (in many species) at length thickened internally or 
coated externally with decurrent filaments; ramuli always pellucidly 
articulate and monosiphonous. Fructification: 1, favelle generally 
in pairs, axillary or sessile on the branches, naked, containing nume- 
rous angular spores; 2, ¢e¢raspores naked, sessile or pedicellate, dis- 
tributed on the ramuli, generally triangularly parted —CaLirHamMNION 
(Lyngb.), from cards, beautiful, and Oapvoor, a little shrub. 
Frons filiformis, ramosa, articulata, monosiphonia, caule ramisque majoribus 
(in pluribus) demum fibris decurrentibus interne vel externe evolutis corticatis 
v. firmatis ; ramulis semper pellucide articulatis. Fruct.: 1, favelle binate, 
axillares v. ad ramos sessiles, nude, sporas numerosas angulatas foventes ; 2, 
tetraspore nuda, ad ramulos sessiles v. pedicellate, triangule v. cruciatim 
divise. 
CaLLITHAMNION penicillatum ; tree-like; stem and branches thickly corti- 
cated throughout, decompoundly branched, ultra-setaceous ; branches 
nearly naked, or thinly beset with minute, byssoid, pencil-like, articu- 
lated ramuli; ramuli clothed with very slender, many times forked 
ramelli; articulations of the ramelli 4-5 times as long as broad; 
fruit unknown. 
C. penicillatum ; dendroideum, caule ramulisque crassissime corticatis decom- 
posite ramosis ultra-setaceis, ramis nudiusculis vel ramulis pusillis byssoideis 
penicillatis articulatis laxe obsessis, ramulis allerne ramelliferis, ramellis 
tenuissimis multoties dichotomis, ramellorum articulis diametro 4—5-plo longio- 
ribus ; fructu utriusque generis ignoto. 
CALLITHAMNION penicillatum, Harv. Alg. Austr. Evsic. n. 516. 
Hap. On the vesicles of MWacrocystis pyrifera, at Pert Plilip Heads, 
rare, W. Ho Hf. 
Groacr. Distr. South coast of Australia. 
Descr. Root a minute disc. Frond 2-3 inches high, and as much in the ex- 
pansion of the branches, thicker than bristle at base, gradually taper- 
ing upwards, irregularly branched, inarticulate, opaque, thickly coated 
with cortical cellules. Branches virgate, subsimple, alternate or secund, 
rarely subopposite, acute, the older ones naked or nearly so, the younger 
emitting minute pencil-like ramuli. Ramuli scarcely a line long, very 
slender, articulated, clothed with excessively minute, soft and slender many 
